[1] At room temperature, the metal that remains liquid is:
A.
Mercury
B.
Platinum
C.
Lead
D.
Zinc
Ans:
Mercury
Explanation :
Mercury is the only metal that is a liquid at normal temperatures and pressure. At room temperatureand pressure, mercury neither readily share valence electrons with other atoms nor interact with each other to form a structure or lattice to become a solid. Infact, mercury is the only metal that doesn't form diatomic molecules in the has phase.
[2] The chemical name or guartz is –
A.
Calcium oxide
B.
Calcium phosphate
C.
Sodium phosphate
D.
Sodium silicate
Ans:
Sodium silicate
Explanation :
Quartz is a compound of one part silicon and two parts of oxygen, silicon dioxide, SiO2. Quartz is the most abundant silica mineral. It is used in a number of industries, the important being glass, foundry, sodium silicate, silicon alloys, etc. The various grades of sodium silicate are characterized by their SiO2:Na2O weight ratio.
[3] The depletion in Ozone layer is caused by -
A.
Nitrous oxide
B.
Carbon dioxide
C.
Chlorofluorocarbons
D.
Methane
Ans:
Chlorofluorocarbons
Explanation :
Chlorofluorocarbons (CFCs), also known as Freon, cause the breakdown of the ozone layer that protects the earth from the sun's ultraviolet (UV) radiation. In the upper atmosphere, the UV-induced breakdown of CFCs releases free, highly reactive chlorine and bromine atoms that lead to the break- down of the stratospheric ozone layer. Owing to ozone depletion in the upper atmosphere, CFCs have been phased out under the Montreal Protocol of 1987.
[4] Which one of the following elements is essential for the construction of nuclear reactors?
A.
Cobalt
B.
Nicke
C.
Zirconium
D.
Tungsten
Ans:
Zirconium
Explanation :
Zirconium is an essential element for the construction of nuclear reactors.
[5] The isotope atoms differ in -
A.
number of neutrons
B.
atomic number
C.
number of electrons
D.
atomic weight
Ans:
number of neutrons
Explanation :
Isotopes are atoms with different atomic masses which have the same atomic number. The atoms of different isotopes are atoms of the same chemical element; they differ in the number of neutrons in the nucleus.
[6] This substance is sweet-smelling and is used in making perfumes and flavouring agents. It is called-
A.
Sodium ethanoate
B.
Lime water
C.
Hydrogencarbonates
D.
Ester
Ans:
Ester
Explanation :
The Correct Answer is Ester. An ester is a sweet-smelling substance, used in making perfumes and flavouring agents.
[7] An acid is a substance which .
A.
Donates a proton
B.
Accepts an electron
C.
Give H+ in water
D.
All
Ans:
All
Explanation :
An acid is a chemical substance whose aqueous solutions are characterized by a sour taste, the ability to turn blue litmus red and the ability to react with bases and certain metals to form salts.
[8] Two electrons in an orbital are differentiated by which of the following?
A.
Magnetic quantum number
B.
Spin quantum number
C.
Principal quantum number
D.
Azimuthal quantum number
Ans:
Spin quantum number
Explanation :
Spin quantum number is the is the fourth quantum number that differentiates two electrons in the same orbital. The Pauli exclusion principle states that "no two electrons in an atom can have the same four quantum numbers. This means that no two electrons can have the same state in an atom. Each electron must have a different spin or occupy a different shell from any other.
[9] The most abundant element in the earth's atmosphere is –
A.
Argon
B.
Nitrogen
C.
Oxygen
D.
Krypton
Ans:
Nitrogen
Explanation :
The most abundant gas in the Earth's atmosphere is nitrogen. Nitrogen makes up 78 percent of the Earth's atmosphere, and it is a permanent gas, which means that its percentage does not change on a daily basis. The rest of the atmosphere is made up of 21 percent oxygen, 0.9 percent argon and 0.1 percent trace gases.
[10] Chemical composition of cement is –
A.
Limestone and Clay
B.
Limestone, Clay and Gypsum
C.
Limestone and Gypsum
D.
Clay and Gypsum
Ans:
Limestone, Clay and Gypsum
Explanation :
The two important raw materials used for the preparation of cement are : • Limestone : The chemical formula of limestone is CaCO3 and it is used in the manufacture of cement just to provide CaO.
[11] Non-metallic character increases from -
A.
Magnesium to Barium
B.
Potassium to Cesium
C.
Oxygen to Selenium
D.
Sodium to Chlorine
Ans:
Sodium to Chlorine
Explanation :
The elements which lose electrons to form cations are known as metals. Metallic character decreases across a period as we move from left to right.
[12] In organic compounds, nitrogen is estimates by -
A.
Dumas method
B.
Carius method
C.
Victor-meyer's method
D.
Liebig's method
Ans:
Dumas method
Explanation :
In Dumas’ method, a known quantity of nitrogen containing organic compound is heated strongly with excess of copper oxide in an atmosphere of carbon dioxide to produce free nitrogen in addition to carbon dioxide and water.
[13] Which one is the pure element?
A.
glass
B.
cement
C.
sodium
D.
none of these
Ans:
sodium
Explanation :
A pure element is a chemical element consisting of only one stable isotope.
[14] The most electropositive elements among the following is :
A.
Cs
B.
Ca
C.
Na
D.
Br
Ans:
Cs
Explanation :
The alkali metals are the most electropositive. Cesium is the most electropositive of the stable elements.Francium, while unstable, is theoretically the most electropositive element.
[15] Which is Known as carbolic acid?
A.
Phenol
B.
Ethanol
C.
Acetic acid
D.
Oxalic acid
Ans:
Phenol
Explanation :
Phenol is also known as carbolic acid. It is an aromatic organic compound with the molecular formula C6H5OH. Phenol and its chemical derivatives are essential for production of polyearbonates, epoxies, Bakelite, nylon, detergents, herbicides such as phenoxy herbicides, and numerous pharmaceutical drugs.
[16] Atomic explosion is triggered by -
A.
thermo nuclear reaction
B.
chemical reaction
C.
controlled chain reaction
D.
uncontrolled chain reaction
Ans:
uncontrolled chain reaction
Explanation :
During an uncontrolled nuclear chain reaction such as atomic explosion, a radioactive substance gives off energy at a rate that increases rapidly with time, leading to large amounts of radiation and possibly an explosion. The radioactive decay of one atom triggers the decay of some of its neighbors, in turn setting off other atoms; thus, producing large amounts of energy.
[17] Stalactites and Stalagmites form due to the precipitation of :
A.
CaCO3
B.
CaCl2
C.
MgCl2
D.
MgCO3
Ans:
CaCO3
Explanation :
Stalactites and stalagmites are formed by water dripping or flowing from fractures on the ceiling of a cave. The dominant mineral in them is calcite (calcium carbonate) or CaCaO3. Their largest displays are formed in caves of limestone and dolomite. Other minerals that may be deposited include other carbonates, opal, chalcedony, limonite, and some sulfides.
[18] Fullerenes form a class of carbon allotropes. The first one to be identified was -
A.
C-59
B.
C-60
C.
C-61
D.
C-69
Ans:
C-60
Explanation :
The first fullerene to be identified was C-60 which has carbon atoms arranged in the shape of a football. Since this looked like the geodesic dome designed by the US architect Buckminster Fuller, the molecule was named fullerene.
[19] Which one of the following is found in Vinegar?
A.
Acetic acid
B.
Propionic acid
C.
Formic acid
D.
Butyric acid
Ans:
Acetic acid
Explanation :
Vinegar is a liquid consisting mainly of acetic acid (CH3COOH) and water. The acetic acid is produced by the fermentation of ethanol by acetic acid bacteria. It is mainly used as a cooking ingredient.
[20] The gas produced in marshy places due to decomposition of vegetation is –
A.
Carbon monoxide
B.
Carbon dioxide
C.
Sulphur dioxide
D.
Methane
Ans:
Methane
Explanation :
Methane gas is a hydrocarbon gas largely composed of methane formed when organic material or vegetation decays in the absence of air. Naturally occurring methane is mainly produced by the process of methanogenesis. It is also known as Swamp Gas.
[21] The chemical name of "Hypo" commonly used in photography is –
A.
Sodium thiosulphate
B.
Silver nitrate
C.
Sodium nitrate
D.
Silver iodide
Ans:
Sodium thiosulphate
Explanation :
An emulsion of sodium thiosulfate is called hypo by photographers. It is used to stop development of exposed film. Thiosulfate converts undeveloped silver bromide grains in the film into water-soluble silver thiosulfate complexes that can be removed when the film is washed.
[22] The process of improving the quality of rubber by heating it with sulphur is called.
A.
Vulcanization
B.
Acceleration
C.
Sulphonation
D.
Galvanization
Ans:
Vulcanization
Explanation :
Vulcanization is a chemical process for converting natural rubber into more durable materials via the addition of sulfur or other equivalent curatives or accelerators. These additives modify the polymer by forming cross-links (bridges) between individual polymer chains.
[23] Which of the following is not a noble gas?
A.
Hydrogen
B.
Helium
C.
Neon
D.
Argon
Ans:
Hydrogen
Explanation :
The noble gases are the chemical elements in group 18 of the periodic table. This chemical series contains helium, neon, argon, krypton, xenon, and radon.
[24] Piped Natural Gas (PNG) is used for –
A.
Mining
B.
Welding
C.
Anaesthesia
D.
Cooking
Ans:
Cooking
Explanation :
PNG is mainly methane - CH4 with a small percentage of other higher hydrocarbons. The ratio of carbon to hydrogen is least in methane and hence it burns almost completely making it the cleanest fuel. Domestic PNG customers, also known as Residential customers, use has for cooking purpose and also for heating water through gas geysers.
[25] Which of the following elements is not present in stainless steel?
A.
Iron
B.
Tungsten
C.
Chromium
D.
Nickel
Ans:
Tungsten
Explanation :
Stainless steel is defined as a steel alloy of iron with a minimum of 10.5% to 11% chromium content by mass. There are different types of stainless steels: when nickel is added, for instance, the austenite structure of iron is stabilized. This crystal structure makes such steels virtually non-magnetic and less brittle at low temperatures.
Explanation :
Mercury is the only metal that is a liquid at normal temperatures and pressure. At room temperatureand pressure, mercury neither readily share valence electrons with other atoms nor interact with each other to form a structure or lattice to become a solid. Infact, mercury is the only metal that doesn't form diatomic molecules in the has phase.
[2] The chemical name or guartz is –
A.
Calcium oxide
B.
Calcium phosphate
C.
Sodium phosphate
D.
Sodium silicate
Ans:
Sodium silicate
Explanation :
Quartz is a compound of one part silicon and two parts of oxygen, silicon dioxide, SiO2. Quartz is the most abundant silica mineral. It is used in a number of industries, the important being glass, foundry, sodium silicate, silicon alloys, etc. The various grades of sodium silicate are characterized by their SiO2:Na2O weight ratio.
[3] The depletion in Ozone layer is caused by -
A.
Nitrous oxide
B.
Carbon dioxide
C.
Chlorofluorocarbons
D.
Methane
Ans:
Chlorofluorocarbons
Explanation :
Chlorofluorocarbons (CFCs), also known as Freon, cause the breakdown of the ozone layer that protects the earth from the sun's ultraviolet (UV) radiation. In the upper atmosphere, the UV-induced breakdown of CFCs releases free, highly reactive chlorine and bromine atoms that lead to the break- down of the stratospheric ozone layer. Owing to ozone depletion in the upper atmosphere, CFCs have been phased out under the Montreal Protocol of 1987.
[4] Which one of the following elements is essential for the construction of nuclear reactors?
A.
Cobalt
B.
Nicke
C.
Zirconium
D.
Tungsten
Ans:
Zirconium
Explanation :
Zirconium is an essential element for the construction of nuclear reactors.
[5] The isotope atoms differ in -
A.
number of neutrons
B.
atomic number
C.
number of electrons
D.
atomic weight
Ans:
number of neutrons
Explanation :
Isotopes are atoms with different atomic masses which have the same atomic number. The atoms of different isotopes are atoms of the same chemical element; they differ in the number of neutrons in the nucleus.
[6] This substance is sweet-smelling and is used in making perfumes and flavouring agents. It is called-
A.
Sodium ethanoate
B.
Lime water
C.
Hydrogencarbonates
D.
Ester
Ans:
Ester
Explanation :
The Correct Answer is Ester. An ester is a sweet-smelling substance, used in making perfumes and flavouring agents.
[7] An acid is a substance which .
A.
Donates a proton
B.
Accepts an electron
C.
Give H+ in water
D.
All
Ans:
All
Explanation :
An acid is a chemical substance whose aqueous solutions are characterized by a sour taste, the ability to turn blue litmus red and the ability to react with bases and certain metals to form salts.
[8] Two electrons in an orbital are differentiated by which of the following?
A.
Magnetic quantum number
B.
Spin quantum number
C.
Principal quantum number
D.
Azimuthal quantum number
Ans:
Spin quantum number
Explanation :
Spin quantum number is the is the fourth quantum number that differentiates two electrons in the same orbital. The Pauli exclusion principle states that "no two electrons in an atom can have the same four quantum numbers. This means that no two electrons can have the same state in an atom. Each electron must have a different spin or occupy a different shell from any other.
[9] The most abundant element in the earth's atmosphere is –
A.
Argon
B.
Nitrogen
C.
Oxygen
D.
Krypton
Ans:
Nitrogen
Explanation :
The most abundant gas in the Earth's atmosphere is nitrogen. Nitrogen makes up 78 percent of the Earth's atmosphere, and it is a permanent gas, which means that its percentage does not change on a daily basis. The rest of the atmosphere is made up of 21 percent oxygen, 0.9 percent argon and 0.1 percent trace gases.
[10] Chemical composition of cement is –
A.
Limestone and Clay
B.
Limestone, Clay and Gypsum
C.
Limestone and Gypsum
D.
Clay and Gypsum
Ans:
Limestone, Clay and Gypsum
Explanation :
The two important raw materials used for the preparation of cement are : • Limestone : The chemical formula of limestone is CaCO3 and it is used in the manufacture of cement just to provide CaO.
[11] Non-metallic character increases from -
A.
Magnesium to Barium
B.
Potassium to Cesium
C.
Oxygen to Selenium
D.
Sodium to Chlorine
Ans:
Sodium to Chlorine
Explanation :
The elements which lose electrons to form cations are known as metals. Metallic character decreases across a period as we move from left to right.
[12] In organic compounds, nitrogen is estimates by -
A.
Dumas method
B.
Carius method
C.
Victor-meyer's method
D.
Liebig's method
Ans:
Dumas method
Explanation :
In Dumas’ method, a known quantity of nitrogen containing organic compound is heated strongly with excess of copper oxide in an atmosphere of carbon dioxide to produce free nitrogen in addition to carbon dioxide and water.
[13] Which one is the pure element?
A.
glass
B.
cement
C.
sodium
D.
none of these
Ans:
sodium
Explanation :
A pure element is a chemical element consisting of only one stable isotope.
[14] The most electropositive elements among the following is :
A.
Cs
B.
Ca
C.
Na
D.
Br
Ans:
Cs
Explanation :
The alkali metals are the most electropositive. Cesium is the most electropositive of the stable elements.Francium, while unstable, is theoretically the most electropositive element.
[15] Which is Known as carbolic acid?
A.
Phenol
B.
Ethanol
C.
Acetic acid
D.
Oxalic acid
Ans:
Phenol
Explanation :
Phenol is also known as carbolic acid. It is an aromatic organic compound with the molecular formula C6H5OH. Phenol and its chemical derivatives are essential for production of polyearbonates, epoxies, Bakelite, nylon, detergents, herbicides such as phenoxy herbicides, and numerous pharmaceutical drugs.
[16] Atomic explosion is triggered by -
A.
thermo nuclear reaction
B.
chemical reaction
C.
controlled chain reaction
D.
uncontrolled chain reaction
Ans:
uncontrolled chain reaction
Explanation :
During an uncontrolled nuclear chain reaction such as atomic explosion, a radioactive substance gives off energy at a rate that increases rapidly with time, leading to large amounts of radiation and possibly an explosion. The radioactive decay of one atom triggers the decay of some of its neighbors, in turn setting off other atoms; thus, producing large amounts of energy.
[17] Stalactites and Stalagmites form due to the precipitation of :
A.
CaCO3
B.
CaCl2
C.
MgCl2
D.
MgCO3
Ans:
CaCO3
Explanation :
Stalactites and stalagmites are formed by water dripping or flowing from fractures on the ceiling of a cave. The dominant mineral in them is calcite (calcium carbonate) or CaCaO3. Their largest displays are formed in caves of limestone and dolomite. Other minerals that may be deposited include other carbonates, opal, chalcedony, limonite, and some sulfides.
[18] Fullerenes form a class of carbon allotropes. The first one to be identified was -
A.
C-59
B.
C-60
C.
C-61
D.
C-69
Ans:
C-60
Explanation :
The first fullerene to be identified was C-60 which has carbon atoms arranged in the shape of a football. Since this looked like the geodesic dome designed by the US architect Buckminster Fuller, the molecule was named fullerene.
[19] Which one of the following is found in Vinegar?
A.
Acetic acid
B.
Propionic acid
C.
Formic acid
D.
Butyric acid
Ans:
Acetic acid
Explanation :
Vinegar is a liquid consisting mainly of acetic acid (CH3COOH) and water. The acetic acid is produced by the fermentation of ethanol by acetic acid bacteria. It is mainly used as a cooking ingredient.
[20] The gas produced in marshy places due to decomposition of vegetation is –
A.
Carbon monoxide
B.
Carbon dioxide
C.
Sulphur dioxide
D.
Methane
Ans:
Methane
Explanation :
Methane gas is a hydrocarbon gas largely composed of methane formed when organic material or vegetation decays in the absence of air. Naturally occurring methane is mainly produced by the process of methanogenesis. It is also known as Swamp Gas.
[21] The chemical name of "Hypo" commonly used in photography is –
A.
Sodium thiosulphate
B.
Silver nitrate
C.
Sodium nitrate
D.
Silver iodide
Ans:
Sodium thiosulphate
Explanation :
An emulsion of sodium thiosulfate is called hypo by photographers. It is used to stop development of exposed film. Thiosulfate converts undeveloped silver bromide grains in the film into water-soluble silver thiosulfate complexes that can be removed when the film is washed.
[22] The process of improving the quality of rubber by heating it with sulphur is called.
A.
Vulcanization
B.
Acceleration
C.
Sulphonation
D.
Galvanization
Ans:
Vulcanization
Explanation :
Vulcanization is a chemical process for converting natural rubber into more durable materials via the addition of sulfur or other equivalent curatives or accelerators. These additives modify the polymer by forming cross-links (bridges) between individual polymer chains.
[23] Which of the following is not a noble gas?
A.
Hydrogen
B.
Helium
C.
Neon
D.
Argon
Ans:
Hydrogen
Explanation :
The noble gases are the chemical elements in group 18 of the periodic table. This chemical series contains helium, neon, argon, krypton, xenon, and radon.
[24] Piped Natural Gas (PNG) is used for –
A.
Mining
B.
Welding
C.
Anaesthesia
D.
Cooking
Ans:
Cooking
Explanation :
PNG is mainly methane - CH4 with a small percentage of other higher hydrocarbons. The ratio of carbon to hydrogen is least in methane and hence it burns almost completely making it the cleanest fuel. Domestic PNG customers, also known as Residential customers, use has for cooking purpose and also for heating water through gas geysers.
[25] Which of the following elements is not present in stainless steel?
A.
Iron
B.
Tungsten
C.
Chromium
D.
Nickel
Ans:
Tungsten
Explanation :
Stainless steel is defined as a steel alloy of iron with a minimum of 10.5% to 11% chromium content by mass. There are different types of stainless steels: when nickel is added, for instance, the austenite structure of iron is stabilized. This crystal structure makes such steels virtually non-magnetic and less brittle at low temperatures.
Explanation :
Chlorofluorocarbons (CFCs), also known as Freon, cause the breakdown of the ozone layer that protects the earth from the sun's ultraviolet (UV) radiation. In the upper atmosphere, the UV-induced breakdown of CFCs releases free, highly reactive chlorine and bromine atoms that lead to the break- down of the stratospheric ozone layer. Owing to ozone depletion in the upper atmosphere, CFCs have been phased out under the Montreal Protocol of 1987.
[4] Which one of the following elements is essential for the construction of nuclear reactors?
A.
Cobalt
B.
Nicke
C.
Zirconium
D.
Tungsten
Ans:
Zirconium
Explanation :
Zirconium is an essential element for the construction of nuclear reactors.
[5] The isotope atoms differ in -
A.
number of neutrons
B.
atomic number
C.
number of electrons
D.
atomic weight
Ans:
number of neutrons
Explanation :
Isotopes are atoms with different atomic masses which have the same atomic number. The atoms of different isotopes are atoms of the same chemical element; they differ in the number of neutrons in the nucleus.
[6] This substance is sweet-smelling and is used in making perfumes and flavouring agents. It is called-
A.
Sodium ethanoate
B.
Lime water
C.
Hydrogencarbonates
D.
Ester
Ans:
Ester
Explanation :
The Correct Answer is Ester. An ester is a sweet-smelling substance, used in making perfumes and flavouring agents.
[7] An acid is a substance which .
A.
Donates a proton
B.
Accepts an electron
C.
Give H+ in water
D.
All
Ans:
All
Explanation :
An acid is a chemical substance whose aqueous solutions are characterized by a sour taste, the ability to turn blue litmus red and the ability to react with bases and certain metals to form salts.
[8] Two electrons in an orbital are differentiated by which of the following?
A.
Magnetic quantum number
B.
Spin quantum number
C.
Principal quantum number
D.
Azimuthal quantum number
Ans:
Spin quantum number
Explanation :
Spin quantum number is the is the fourth quantum number that differentiates two electrons in the same orbital. The Pauli exclusion principle states that "no two electrons in an atom can have the same four quantum numbers. This means that no two electrons can have the same state in an atom. Each electron must have a different spin or occupy a different shell from any other.
[9] The most abundant element in the earth's atmosphere is –
A.
Argon
B.
Nitrogen
C.
Oxygen
D.
Krypton
Ans:
Nitrogen
Explanation :
The most abundant gas in the Earth's atmosphere is nitrogen. Nitrogen makes up 78 percent of the Earth's atmosphere, and it is a permanent gas, which means that its percentage does not change on a daily basis. The rest of the atmosphere is made up of 21 percent oxygen, 0.9 percent argon and 0.1 percent trace gases.
[10] Chemical composition of cement is –
A.
Limestone and Clay
B.
Limestone, Clay and Gypsum
C.
Limestone and Gypsum
D.
Clay and Gypsum
Ans:
Limestone, Clay and Gypsum
Explanation :
The two important raw materials used for the preparation of cement are : • Limestone : The chemical formula of limestone is CaCO3 and it is used in the manufacture of cement just to provide CaO.
[11] Non-metallic character increases from -
A.
Magnesium to Barium
B.
Potassium to Cesium
C.
Oxygen to Selenium
D.
Sodium to Chlorine
Ans:
Sodium to Chlorine
Explanation :
The elements which lose electrons to form cations are known as metals. Metallic character decreases across a period as we move from left to right.
[12] In organic compounds, nitrogen is estimates by -
A.
Dumas method
B.
Carius method
C.
Victor-meyer's method
D.
Liebig's method
Ans:
Dumas method
Explanation :
In Dumas’ method, a known quantity of nitrogen containing organic compound is heated strongly with excess of copper oxide in an atmosphere of carbon dioxide to produce free nitrogen in addition to carbon dioxide and water.
[13] Which one is the pure element?
A.
glass
B.
cement
C.
sodium
D.
none of these
Ans:
sodium
Explanation :
A pure element is a chemical element consisting of only one stable isotope.
[14] The most electropositive elements among the following is :
A.
Cs
B.
Ca
C.
Na
D.
Br
Ans:
Cs
Explanation :
The alkali metals are the most electropositive. Cesium is the most electropositive of the stable elements.Francium, while unstable, is theoretically the most electropositive element.
[15] Which is Known as carbolic acid?
A.
Phenol
B.
Ethanol
C.
Acetic acid
D.
Oxalic acid
Ans:
Phenol
Explanation :
Phenol is also known as carbolic acid. It is an aromatic organic compound with the molecular formula C6H5OH. Phenol and its chemical derivatives are essential for production of polyearbonates, epoxies, Bakelite, nylon, detergents, herbicides such as phenoxy herbicides, and numerous pharmaceutical drugs.
[16] Atomic explosion is triggered by -
A.
thermo nuclear reaction
B.
chemical reaction
C.
controlled chain reaction
D.
uncontrolled chain reaction
Ans:
uncontrolled chain reaction
Explanation :
During an uncontrolled nuclear chain reaction such as atomic explosion, a radioactive substance gives off energy at a rate that increases rapidly with time, leading to large amounts of radiation and possibly an explosion. The radioactive decay of one atom triggers the decay of some of its neighbors, in turn setting off other atoms; thus, producing large amounts of energy.
[17] Stalactites and Stalagmites form due to the precipitation of :
A.
CaCO3
B.
CaCl2
C.
MgCl2
D.
MgCO3
Ans:
CaCO3
Explanation :
Stalactites and stalagmites are formed by water dripping or flowing from fractures on the ceiling of a cave. The dominant mineral in them is calcite (calcium carbonate) or CaCaO3. Their largest displays are formed in caves of limestone and dolomite. Other minerals that may be deposited include other carbonates, opal, chalcedony, limonite, and some sulfides.
[18] Fullerenes form a class of carbon allotropes. The first one to be identified was -
A.
C-59
B.
C-60
C.
C-61
D.
C-69
Ans:
C-60
Explanation :
The first fullerene to be identified was C-60 which has carbon atoms arranged in the shape of a football. Since this looked like the geodesic dome designed by the US architect Buckminster Fuller, the molecule was named fullerene.
[19] Which one of the following is found in Vinegar?
A.
Acetic acid
B.
Propionic acid
C.
Formic acid
D.
Butyric acid
Ans:
Acetic acid
Explanation :
Vinegar is a liquid consisting mainly of acetic acid (CH3COOH) and water. The acetic acid is produced by the fermentation of ethanol by acetic acid bacteria. It is mainly used as a cooking ingredient.
[20] The gas produced in marshy places due to decomposition of vegetation is –
A.
Carbon monoxide
B.
Carbon dioxide
C.
Sulphur dioxide
D.
Methane
Ans:
Methane
Explanation :
Methane gas is a hydrocarbon gas largely composed of methane formed when organic material or vegetation decays in the absence of air. Naturally occurring methane is mainly produced by the process of methanogenesis. It is also known as Swamp Gas.
[21] The chemical name of "Hypo" commonly used in photography is –
A.
Sodium thiosulphate
B.
Silver nitrate
C.
Sodium nitrate
D.
Silver iodide
Ans:
Sodium thiosulphate
Explanation :
An emulsion of sodium thiosulfate is called hypo by photographers. It is used to stop development of exposed film. Thiosulfate converts undeveloped silver bromide grains in the film into water-soluble silver thiosulfate complexes that can be removed when the film is washed.
[22] The process of improving the quality of rubber by heating it with sulphur is called.
A.
Vulcanization
B.
Acceleration
C.
Sulphonation
D.
Galvanization
Ans:
Vulcanization
Explanation :
Vulcanization is a chemical process for converting natural rubber into more durable materials via the addition of sulfur or other equivalent curatives or accelerators. These additives modify the polymer by forming cross-links (bridges) between individual polymer chains.
[23] Which of the following is not a noble gas?
A.
Hydrogen
B.
Helium
C.
Neon
D.
Argon
Ans:
Hydrogen
Explanation :
The noble gases are the chemical elements in group 18 of the periodic table. This chemical series contains helium, neon, argon, krypton, xenon, and radon.
[24] Piped Natural Gas (PNG) is used for –
A.
Mining
B.
Welding
C.
Anaesthesia
D.
Cooking
Ans:
Cooking
Explanation :
PNG is mainly methane - CH4 with a small percentage of other higher hydrocarbons. The ratio of carbon to hydrogen is least in methane and hence it burns almost completely making it the cleanest fuel. Domestic PNG customers, also known as Residential customers, use has for cooking purpose and also for heating water through gas geysers.
[25] Which of the following elements is not present in stainless steel?
A.
Iron
B.
Tungsten
C.
Chromium
D.
Nickel
Ans:
Tungsten
Explanation :
Stainless steel is defined as a steel alloy of iron with a minimum of 10.5% to 11% chromium content by mass. There are different types of stainless steels: when nickel is added, for instance, the austenite structure of iron is stabilized. This crystal structure makes such steels virtually non-magnetic and less brittle at low temperatures.
Explanation :
Isotopes are atoms with different atomic masses which have the same atomic number. The atoms of different isotopes are atoms of the same chemical element; they differ in the number of neutrons in the nucleus.
[6] This substance is sweet-smelling and is used in making perfumes and flavouring agents. It is called-
A.
Sodium ethanoate
B.
Lime water
C.
Hydrogencarbonates
D.
Ester
Ans:
Ester
Explanation :
The Correct Answer is Ester. An ester is a sweet-smelling substance, used in making perfumes and flavouring agents.
[7] An acid is a substance which .
A.
Donates a proton
B.
Accepts an electron
C.
Give H+ in water
D.
All
Ans:
All
Explanation :
An acid is a chemical substance whose aqueous solutions are characterized by a sour taste, the ability to turn blue litmus red and the ability to react with bases and certain metals to form salts.
[8] Two electrons in an orbital are differentiated by which of the following?
A.
Magnetic quantum number
B.
Spin quantum number
C.
Principal quantum number
D.
Azimuthal quantum number
Ans:
Spin quantum number
Explanation :
Spin quantum number is the is the fourth quantum number that differentiates two electrons in the same orbital. The Pauli exclusion principle states that "no two electrons in an atom can have the same four quantum numbers. This means that no two electrons can have the same state in an atom. Each electron must have a different spin or occupy a different shell from any other.
[9] The most abundant element in the earth's atmosphere is –
A.
Argon
B.
Nitrogen
C.
Oxygen
D.
Krypton
Ans:
Nitrogen
Explanation :
The most abundant gas in the Earth's atmosphere is nitrogen. Nitrogen makes up 78 percent of the Earth's atmosphere, and it is a permanent gas, which means that its percentage does not change on a daily basis. The rest of the atmosphere is made up of 21 percent oxygen, 0.9 percent argon and 0.1 percent trace gases.
[10] Chemical composition of cement is –
A.
Limestone and Clay
B.
Limestone, Clay and Gypsum
C.
Limestone and Gypsum
D.
Clay and Gypsum
Ans:
Limestone, Clay and Gypsum
Explanation :
The two important raw materials used for the preparation of cement are : • Limestone : The chemical formula of limestone is CaCO3 and it is used in the manufacture of cement just to provide CaO.
[11] Non-metallic character increases from -
A.
Magnesium to Barium
B.
Potassium to Cesium
C.
Oxygen to Selenium
D.
Sodium to Chlorine
Ans:
Sodium to Chlorine
Explanation :
The elements which lose electrons to form cations are known as metals. Metallic character decreases across a period as we move from left to right.
[12] In organic compounds, nitrogen is estimates by -
A.
Dumas method
B.
Carius method
C.
Victor-meyer's method
D.
Liebig's method
Ans:
Dumas method
Explanation :
In Dumas’ method, a known quantity of nitrogen containing organic compound is heated strongly with excess of copper oxide in an atmosphere of carbon dioxide to produce free nitrogen in addition to carbon dioxide and water.
[13] Which one is the pure element?
A.
glass
B.
cement
C.
sodium
D.
none of these
Ans:
sodium
Explanation :
A pure element is a chemical element consisting of only one stable isotope.
[14] The most electropositive elements among the following is :
A.
Cs
B.
Ca
C.
Na
D.
Br
Ans:
Cs
Explanation :
The alkali metals are the most electropositive. Cesium is the most electropositive of the stable elements.Francium, while unstable, is theoretically the most electropositive element.
[15] Which is Known as carbolic acid?
A.
Phenol
B.
Ethanol
C.
Acetic acid
D.
Oxalic acid
Ans:
Phenol
Explanation :
Phenol is also known as carbolic acid. It is an aromatic organic compound with the molecular formula C6H5OH. Phenol and its chemical derivatives are essential for production of polyearbonates, epoxies, Bakelite, nylon, detergents, herbicides such as phenoxy herbicides, and numerous pharmaceutical drugs.
[16] Atomic explosion is triggered by -
A.
thermo nuclear reaction
B.
chemical reaction
C.
controlled chain reaction
D.
uncontrolled chain reaction
Ans:
uncontrolled chain reaction
Explanation :
During an uncontrolled nuclear chain reaction such as atomic explosion, a radioactive substance gives off energy at a rate that increases rapidly with time, leading to large amounts of radiation and possibly an explosion. The radioactive decay of one atom triggers the decay of some of its neighbors, in turn setting off other atoms; thus, producing large amounts of energy.
[17] Stalactites and Stalagmites form due to the precipitation of :
A.
CaCO3
B.
CaCl2
C.
MgCl2
D.
MgCO3
Ans:
CaCO3
Explanation :
Stalactites and stalagmites are formed by water dripping or flowing from fractures on the ceiling of a cave. The dominant mineral in them is calcite (calcium carbonate) or CaCaO3. Their largest displays are formed in caves of limestone and dolomite. Other minerals that may be deposited include other carbonates, opal, chalcedony, limonite, and some sulfides.
[18] Fullerenes form a class of carbon allotropes. The first one to be identified was -
A.
C-59
B.
C-60
C.
C-61
D.
C-69
Ans:
C-60
Explanation :
The first fullerene to be identified was C-60 which has carbon atoms arranged in the shape of a football. Since this looked like the geodesic dome designed by the US architect Buckminster Fuller, the molecule was named fullerene.
[19] Which one of the following is found in Vinegar?
A.
Acetic acid
B.
Propionic acid
C.
Formic acid
D.
Butyric acid
Ans:
Acetic acid
Explanation :
Vinegar is a liquid consisting mainly of acetic acid (CH3COOH) and water. The acetic acid is produced by the fermentation of ethanol by acetic acid bacteria. It is mainly used as a cooking ingredient.
[20] The gas produced in marshy places due to decomposition of vegetation is –
A.
Carbon monoxide
B.
Carbon dioxide
C.
Sulphur dioxide
D.
Methane
Ans:
Methane
Explanation :
Methane gas is a hydrocarbon gas largely composed of methane formed when organic material or vegetation decays in the absence of air. Naturally occurring methane is mainly produced by the process of methanogenesis. It is also known as Swamp Gas.
[21] The chemical name of "Hypo" commonly used in photography is –
A.
Sodium thiosulphate
B.
Silver nitrate
C.
Sodium nitrate
D.
Silver iodide
Ans:
Sodium thiosulphate
Explanation :
An emulsion of sodium thiosulfate is called hypo by photographers. It is used to stop development of exposed film. Thiosulfate converts undeveloped silver bromide grains in the film into water-soluble silver thiosulfate complexes that can be removed when the film is washed.
[22] The process of improving the quality of rubber by heating it with sulphur is called.
A.
Vulcanization
B.
Acceleration
C.
Sulphonation
D.
Galvanization
Ans:
Vulcanization
Explanation :
Vulcanization is a chemical process for converting natural rubber into more durable materials via the addition of sulfur or other equivalent curatives or accelerators. These additives modify the polymer by forming cross-links (bridges) between individual polymer chains.
[23] Which of the following is not a noble gas?
A.
Hydrogen
B.
Helium
C.
Neon
D.
Argon
Ans:
Hydrogen
Explanation :
The noble gases are the chemical elements in group 18 of the periodic table. This chemical series contains helium, neon, argon, krypton, xenon, and radon.
[24] Piped Natural Gas (PNG) is used for –
A.
Mining
B.
Welding
C.
Anaesthesia
D.
Cooking
Ans:
Cooking
Explanation :
PNG is mainly methane - CH4 with a small percentage of other higher hydrocarbons. The ratio of carbon to hydrogen is least in methane and hence it burns almost completely making it the cleanest fuel. Domestic PNG customers, also known as Residential customers, use has for cooking purpose and also for heating water through gas geysers.
[25] Which of the following elements is not present in stainless steel?
A.
Iron
B.
Tungsten
C.
Chromium
D.
Nickel
Ans:
Tungsten
Explanation :
Stainless steel is defined as a steel alloy of iron with a minimum of 10.5% to 11% chromium content by mass. There are different types of stainless steels: when nickel is added, for instance, the austenite structure of iron is stabilized. This crystal structure makes such steels virtually non-magnetic and less brittle at low temperatures.
Explanation :
An acid is a chemical substance whose aqueous solutions are characterized by a sour taste, the ability to turn blue litmus red and the ability to react with bases and certain metals to form salts.
[8] Two electrons in an orbital are differentiated by which of the following?
A.
Magnetic quantum number
B.
Spin quantum number
C.
Principal quantum number
D.
Azimuthal quantum number
Ans:
Spin quantum number
Explanation :
Spin quantum number is the is the fourth quantum number that differentiates two electrons in the same orbital. The Pauli exclusion principle states that "no two electrons in an atom can have the same four quantum numbers. This means that no two electrons can have the same state in an atom. Each electron must have a different spin or occupy a different shell from any other.
[9] The most abundant element in the earth's atmosphere is –
A.
Argon
B.
Nitrogen
C.
Oxygen
D.
Krypton
Ans:
Nitrogen
Explanation :
The most abundant gas in the Earth's atmosphere is nitrogen. Nitrogen makes up 78 percent of the Earth's atmosphere, and it is a permanent gas, which means that its percentage does not change on a daily basis. The rest of the atmosphere is made up of 21 percent oxygen, 0.9 percent argon and 0.1 percent trace gases.
[10] Chemical composition of cement is –
A.
Limestone and Clay
B.
Limestone, Clay and Gypsum
C.
Limestone and Gypsum
D.
Clay and Gypsum
Ans:
Limestone, Clay and Gypsum
Explanation :
The two important raw materials used for the preparation of cement are : • Limestone : The chemical formula of limestone is CaCO3 and it is used in the manufacture of cement just to provide CaO.
[11] Non-metallic character increases from -
A.
Magnesium to Barium
B.
Potassium to Cesium
C.
Oxygen to Selenium
D.
Sodium to Chlorine
Ans:
Sodium to Chlorine
Explanation :
The elements which lose electrons to form cations are known as metals. Metallic character decreases across a period as we move from left to right.
[12] In organic compounds, nitrogen is estimates by -
A.
Dumas method
B.
Carius method
C.
Victor-meyer's method
D.
Liebig's method
Ans:
Dumas method
Explanation :
In Dumas’ method, a known quantity of nitrogen containing organic compound is heated strongly with excess of copper oxide in an atmosphere of carbon dioxide to produce free nitrogen in addition to carbon dioxide and water.
[13] Which one is the pure element?
A.
glass
B.
cement
C.
sodium
D.
none of these
Ans:
sodium
Explanation :
A pure element is a chemical element consisting of only one stable isotope.
[14] The most electropositive elements among the following is :
A.
Cs
B.
Ca
C.
Na
D.
Br
Ans:
Cs
Explanation :
The alkali metals are the most electropositive. Cesium is the most electropositive of the stable elements.Francium, while unstable, is theoretically the most electropositive element.
[15] Which is Known as carbolic acid?
A.
Phenol
B.
Ethanol
C.
Acetic acid
D.
Oxalic acid
Ans:
Phenol
Explanation :
Phenol is also known as carbolic acid. It is an aromatic organic compound with the molecular formula C6H5OH. Phenol and its chemical derivatives are essential for production of polyearbonates, epoxies, Bakelite, nylon, detergents, herbicides such as phenoxy herbicides, and numerous pharmaceutical drugs.
[16] Atomic explosion is triggered by -
A.
thermo nuclear reaction
B.
chemical reaction
C.
controlled chain reaction
D.
uncontrolled chain reaction
Ans:
uncontrolled chain reaction
Explanation :
During an uncontrolled nuclear chain reaction such as atomic explosion, a radioactive substance gives off energy at a rate that increases rapidly with time, leading to large amounts of radiation and possibly an explosion. The radioactive decay of one atom triggers the decay of some of its neighbors, in turn setting off other atoms; thus, producing large amounts of energy.
[17] Stalactites and Stalagmites form due to the precipitation of :
A.
CaCO3
B.
CaCl2
C.
MgCl2
D.
MgCO3
Ans:
CaCO3
Explanation :
Stalactites and stalagmites are formed by water dripping or flowing from fractures on the ceiling of a cave. The dominant mineral in them is calcite (calcium carbonate) or CaCaO3. Their largest displays are formed in caves of limestone and dolomite. Other minerals that may be deposited include other carbonates, opal, chalcedony, limonite, and some sulfides.
[18] Fullerenes form a class of carbon allotropes. The first one to be identified was -
A.
C-59
B.
C-60
C.
C-61
D.
C-69
Ans:
C-60
Explanation :
The first fullerene to be identified was C-60 which has carbon atoms arranged in the shape of a football. Since this looked like the geodesic dome designed by the US architect Buckminster Fuller, the molecule was named fullerene.
[19] Which one of the following is found in Vinegar?
A.
Acetic acid
B.
Propionic acid
C.
Formic acid
D.
Butyric acid
Ans:
Acetic acid
Explanation :
Vinegar is a liquid consisting mainly of acetic acid (CH3COOH) and water. The acetic acid is produced by the fermentation of ethanol by acetic acid bacteria. It is mainly used as a cooking ingredient.
[20] The gas produced in marshy places due to decomposition of vegetation is –
A.
Carbon monoxide
B.
Carbon dioxide
C.
Sulphur dioxide
D.
Methane
Ans:
Methane
Explanation :
Methane gas is a hydrocarbon gas largely composed of methane formed when organic material or vegetation decays in the absence of air. Naturally occurring methane is mainly produced by the process of methanogenesis. It is also known as Swamp Gas.
[21] The chemical name of "Hypo" commonly used in photography is –
A.
Sodium thiosulphate
B.
Silver nitrate
C.
Sodium nitrate
D.
Silver iodide
Ans:
Sodium thiosulphate
Explanation :
An emulsion of sodium thiosulfate is called hypo by photographers. It is used to stop development of exposed film. Thiosulfate converts undeveloped silver bromide grains in the film into water-soluble silver thiosulfate complexes that can be removed when the film is washed.
[22] The process of improving the quality of rubber by heating it with sulphur is called.
A.
Vulcanization
B.
Acceleration
C.
Sulphonation
D.
Galvanization
Ans:
Vulcanization
Explanation :
Vulcanization is a chemical process for converting natural rubber into more durable materials via the addition of sulfur or other equivalent curatives or accelerators. These additives modify the polymer by forming cross-links (bridges) between individual polymer chains.
[23] Which of the following is not a noble gas?
A.
Hydrogen
B.
Helium
C.
Neon
D.
Argon
Ans:
Hydrogen
Explanation :
The noble gases are the chemical elements in group 18 of the periodic table. This chemical series contains helium, neon, argon, krypton, xenon, and radon.
[24] Piped Natural Gas (PNG) is used for –
A.
Mining
B.
Welding
C.
Anaesthesia
D.
Cooking
Ans:
Cooking
Explanation :
PNG is mainly methane - CH4 with a small percentage of other higher hydrocarbons. The ratio of carbon to hydrogen is least in methane and hence it burns almost completely making it the cleanest fuel. Domestic PNG customers, also known as Residential customers, use has for cooking purpose and also for heating water through gas geysers.
[25] Which of the following elements is not present in stainless steel?
A.
Iron
B.
Tungsten
C.
Chromium
D.
Nickel
Ans:
Tungsten
Explanation :
Stainless steel is defined as a steel alloy of iron with a minimum of 10.5% to 11% chromium content by mass. There are different types of stainless steels: when nickel is added, for instance, the austenite structure of iron is stabilized. This crystal structure makes such steels virtually non-magnetic and less brittle at low temperatures.
Explanation :
The most abundant gas in the Earth's atmosphere is nitrogen. Nitrogen makes up 78 percent of the Earth's atmosphere, and it is a permanent gas, which means that its percentage does not change on a daily basis. The rest of the atmosphere is made up of 21 percent oxygen, 0.9 percent argon and 0.1 percent trace gases.
[10] Chemical composition of cement is –
A.
Limestone and Clay
B.
Limestone, Clay and Gypsum
C.
Limestone and Gypsum
D.
Clay and Gypsum
Ans:
Limestone, Clay and Gypsum
Explanation :
The two important raw materials used for the preparation of cement are : • Limestone : The chemical formula of limestone is CaCO3 and it is used in the manufacture of cement just to provide CaO.
[11] Non-metallic character increases from -
A.
Magnesium to Barium
B.
Potassium to Cesium
C.
Oxygen to Selenium
D.
Sodium to Chlorine
Ans:
Sodium to Chlorine
Explanation :
The elements which lose electrons to form cations are known as metals. Metallic character decreases across a period as we move from left to right.
[12] In organic compounds, nitrogen is estimates by -
A.
Dumas method
B.
Carius method
C.
Victor-meyer's method
D.
Liebig's method
Ans:
Dumas method
Explanation :
In Dumas’ method, a known quantity of nitrogen containing organic compound is heated strongly with excess of copper oxide in an atmosphere of carbon dioxide to produce free nitrogen in addition to carbon dioxide and water.
[13] Which one is the pure element?
A.
glass
B.
cement
C.
sodium
D.
none of these
Ans:
sodium
Explanation :
A pure element is a chemical element consisting of only one stable isotope.
[14] The most electropositive elements among the following is :
A.
Cs
B.
Ca
C.
Na
D.
Br
Ans:
Cs
Explanation :
The alkali metals are the most electropositive. Cesium is the most electropositive of the stable elements.Francium, while unstable, is theoretically the most electropositive element.
[15] Which is Known as carbolic acid?
A.
Phenol
B.
Ethanol
C.
Acetic acid
D.
Oxalic acid
Ans:
Phenol
Explanation :
Phenol is also known as carbolic acid. It is an aromatic organic compound with the molecular formula C6H5OH. Phenol and its chemical derivatives are essential for production of polyearbonates, epoxies, Bakelite, nylon, detergents, herbicides such as phenoxy herbicides, and numerous pharmaceutical drugs.
[16] Atomic explosion is triggered by -
A.
thermo nuclear reaction
B.
chemical reaction
C.
controlled chain reaction
D.
uncontrolled chain reaction
Ans:
uncontrolled chain reaction
Explanation :
During an uncontrolled nuclear chain reaction such as atomic explosion, a radioactive substance gives off energy at a rate that increases rapidly with time, leading to large amounts of radiation and possibly an explosion. The radioactive decay of one atom triggers the decay of some of its neighbors, in turn setting off other atoms; thus, producing large amounts of energy.
[17] Stalactites and Stalagmites form due to the precipitation of :
A.
CaCO3
B.
CaCl2
C.
MgCl2
D.
MgCO3
Ans:
CaCO3
Explanation :
Stalactites and stalagmites are formed by water dripping or flowing from fractures on the ceiling of a cave. The dominant mineral in them is calcite (calcium carbonate) or CaCaO3. Their largest displays are formed in caves of limestone and dolomite. Other minerals that may be deposited include other carbonates, opal, chalcedony, limonite, and some sulfides.
[18] Fullerenes form a class of carbon allotropes. The first one to be identified was -
A.
C-59
B.
C-60
C.
C-61
D.
C-69
Ans:
C-60
Explanation :
The first fullerene to be identified was C-60 which has carbon atoms arranged in the shape of a football. Since this looked like the geodesic dome designed by the US architect Buckminster Fuller, the molecule was named fullerene.
[19] Which one of the following is found in Vinegar?
A.
Acetic acid
B.
Propionic acid
C.
Formic acid
D.
Butyric acid
Ans:
Acetic acid
Explanation :
Vinegar is a liquid consisting mainly of acetic acid (CH3COOH) and water. The acetic acid is produced by the fermentation of ethanol by acetic acid bacteria. It is mainly used as a cooking ingredient.
[20] The gas produced in marshy places due to decomposition of vegetation is –
A.
Carbon monoxide
B.
Carbon dioxide
C.
Sulphur dioxide
D.
Methane
Ans:
Methane
Explanation :
Methane gas is a hydrocarbon gas largely composed of methane formed when organic material or vegetation decays in the absence of air. Naturally occurring methane is mainly produced by the process of methanogenesis. It is also known as Swamp Gas.
[21] The chemical name of "Hypo" commonly used in photography is –
A.
Sodium thiosulphate
B.
Silver nitrate
C.
Sodium nitrate
D.
Silver iodide
Ans:
Sodium thiosulphate
Explanation :
An emulsion of sodium thiosulfate is called hypo by photographers. It is used to stop development of exposed film. Thiosulfate converts undeveloped silver bromide grains in the film into water-soluble silver thiosulfate complexes that can be removed when the film is washed.
[22] The process of improving the quality of rubber by heating it with sulphur is called.
A.
Vulcanization
B.
Acceleration
C.
Sulphonation
D.
Galvanization
Ans:
Vulcanization
Explanation :
Vulcanization is a chemical process for converting natural rubber into more durable materials via the addition of sulfur or other equivalent curatives or accelerators. These additives modify the polymer by forming cross-links (bridges) between individual polymer chains.
[23] Which of the following is not a noble gas?
A.
Hydrogen
B.
Helium
C.
Neon
D.
Argon
Ans:
Hydrogen
Explanation :
The noble gases are the chemical elements in group 18 of the periodic table. This chemical series contains helium, neon, argon, krypton, xenon, and radon.
[24] Piped Natural Gas (PNG) is used for –
A.
Mining
B.
Welding
C.
Anaesthesia
D.
Cooking
Ans:
Cooking
Explanation :
PNG is mainly methane - CH4 with a small percentage of other higher hydrocarbons. The ratio of carbon to hydrogen is least in methane and hence it burns almost completely making it the cleanest fuel. Domestic PNG customers, also known as Residential customers, use has for cooking purpose and also for heating water through gas geysers.
[25] Which of the following elements is not present in stainless steel?
A.
Iron
B.
Tungsten
C.
Chromium
D.
Nickel
Ans:
Tungsten
Explanation :
Stainless steel is defined as a steel alloy of iron with a minimum of 10.5% to 11% chromium content by mass. There are different types of stainless steels: when nickel is added, for instance, the austenite structure of iron is stabilized. This crystal structure makes such steels virtually non-magnetic and less brittle at low temperatures.
Explanation :
The elements which lose electrons to form cations are known as metals. Metallic character decreases across a period as we move from left to right.
[12] In organic compounds, nitrogen is estimates by -
A.
Dumas method
B.
Carius method
C.
Victor-meyer's method
D.
Liebig's method
Ans:
Dumas method
Explanation :
In Dumas’ method, a known quantity of nitrogen containing organic compound is heated strongly with excess of copper oxide in an atmosphere of carbon dioxide to produce free nitrogen in addition to carbon dioxide and water.
[13] Which one is the pure element?
A.
glass
B.
cement
C.
sodium
D.
none of these
Ans:
sodium
Explanation :
A pure element is a chemical element consisting of only one stable isotope.
[14] The most electropositive elements among the following is :
A.
Cs
B.
Ca
C.
Na
D.
Br
Ans:
Cs
Explanation :
The alkali metals are the most electropositive. Cesium is the most electropositive of the stable elements.Francium, while unstable, is theoretically the most electropositive element.
[15] Which is Known as carbolic acid?
A.
Phenol
B.
Ethanol
C.
Acetic acid
D.
Oxalic acid
Ans:
Phenol
Explanation :
Phenol is also known as carbolic acid. It is an aromatic organic compound with the molecular formula C6H5OH. Phenol and its chemical derivatives are essential for production of polyearbonates, epoxies, Bakelite, nylon, detergents, herbicides such as phenoxy herbicides, and numerous pharmaceutical drugs.
[16] Atomic explosion is triggered by -
A.
thermo nuclear reaction
B.
chemical reaction
C.
controlled chain reaction
D.
uncontrolled chain reaction
Ans:
uncontrolled chain reaction
Explanation :
During an uncontrolled nuclear chain reaction such as atomic explosion, a radioactive substance gives off energy at a rate that increases rapidly with time, leading to large amounts of radiation and possibly an explosion. The radioactive decay of one atom triggers the decay of some of its neighbors, in turn setting off other atoms; thus, producing large amounts of energy.
[17] Stalactites and Stalagmites form due to the precipitation of :
A.
CaCO3
B.
CaCl2
C.
MgCl2
D.
MgCO3
Ans:
CaCO3
Explanation :
Stalactites and stalagmites are formed by water dripping or flowing from fractures on the ceiling of a cave. The dominant mineral in them is calcite (calcium carbonate) or CaCaO3. Their largest displays are formed in caves of limestone and dolomite. Other minerals that may be deposited include other carbonates, opal, chalcedony, limonite, and some sulfides.
[18] Fullerenes form a class of carbon allotropes. The first one to be identified was -
A.
C-59
B.
C-60
C.
C-61
D.
C-69
Ans:
C-60
Explanation :
The first fullerene to be identified was C-60 which has carbon atoms arranged in the shape of a football. Since this looked like the geodesic dome designed by the US architect Buckminster Fuller, the molecule was named fullerene.
[19] Which one of the following is found in Vinegar?
A.
Acetic acid
B.
Propionic acid
C.
Formic acid
D.
Butyric acid
Ans:
Acetic acid
Explanation :
Vinegar is a liquid consisting mainly of acetic acid (CH3COOH) and water. The acetic acid is produced by the fermentation of ethanol by acetic acid bacteria. It is mainly used as a cooking ingredient.
[20] The gas produced in marshy places due to decomposition of vegetation is –
A.
Carbon monoxide
B.
Carbon dioxide
C.
Sulphur dioxide
D.
Methane
Ans:
Methane
Explanation :
Methane gas is a hydrocarbon gas largely composed of methane formed when organic material or vegetation decays in the absence of air. Naturally occurring methane is mainly produced by the process of methanogenesis. It is also known as Swamp Gas.
[21] The chemical name of "Hypo" commonly used in photography is –
A.
Sodium thiosulphate
B.
Silver nitrate
C.
Sodium nitrate
D.
Silver iodide
Ans:
Sodium thiosulphate
Explanation :
An emulsion of sodium thiosulfate is called hypo by photographers. It is used to stop development of exposed film. Thiosulfate converts undeveloped silver bromide grains in the film into water-soluble silver thiosulfate complexes that can be removed when the film is washed.
[22] The process of improving the quality of rubber by heating it with sulphur is called.
A.
Vulcanization
B.
Acceleration
C.
Sulphonation
D.
Galvanization
Ans:
Vulcanization
Explanation :
Vulcanization is a chemical process for converting natural rubber into more durable materials via the addition of sulfur or other equivalent curatives or accelerators. These additives modify the polymer by forming cross-links (bridges) between individual polymer chains.
[23] Which of the following is not a noble gas?
A.
Hydrogen
B.
Helium
C.
Neon
D.
Argon
Ans:
Hydrogen
Explanation :
The noble gases are the chemical elements in group 18 of the periodic table. This chemical series contains helium, neon, argon, krypton, xenon, and radon.
[24] Piped Natural Gas (PNG) is used for –
A.
Mining
B.
Welding
C.
Anaesthesia
D.
Cooking
Ans:
Cooking
Explanation :
PNG is mainly methane - CH4 with a small percentage of other higher hydrocarbons. The ratio of carbon to hydrogen is least in methane and hence it burns almost completely making it the cleanest fuel. Domestic PNG customers, also known as Residential customers, use has for cooking purpose and also for heating water through gas geysers.
[25] Which of the following elements is not present in stainless steel?
A.
Iron
B.
Tungsten
C.
Chromium
D.
Nickel
Ans:
Tungsten
Explanation :
Stainless steel is defined as a steel alloy of iron with a minimum of 10.5% to 11% chromium content by mass. There are different types of stainless steels: when nickel is added, for instance, the austenite structure of iron is stabilized. This crystal structure makes such steels virtually non-magnetic and less brittle at low temperatures.
Explanation :
A pure element is a chemical element consisting of only one stable isotope.
[14] The most electropositive elements among the following is :
A.
Cs
B.
Ca
C.
Na
D.
Br
Ans:
Cs
Explanation :
The alkali metals are the most electropositive. Cesium is the most electropositive of the stable elements.Francium, while unstable, is theoretically the most electropositive element.
[15] Which is Known as carbolic acid?
A.
Phenol
B.
Ethanol
C.
Acetic acid
D.
Oxalic acid
Ans:
Phenol
Explanation :
Phenol is also known as carbolic acid. It is an aromatic organic compound with the molecular formula C6H5OH. Phenol and its chemical derivatives are essential for production of polyearbonates, epoxies, Bakelite, nylon, detergents, herbicides such as phenoxy herbicides, and numerous pharmaceutical drugs.
[16] Atomic explosion is triggered by -
A.
thermo nuclear reaction
B.
chemical reaction
C.
controlled chain reaction
D.
uncontrolled chain reaction
Ans:
uncontrolled chain reaction
Explanation :
During an uncontrolled nuclear chain reaction such as atomic explosion, a radioactive substance gives off energy at a rate that increases rapidly with time, leading to large amounts of radiation and possibly an explosion. The radioactive decay of one atom triggers the decay of some of its neighbors, in turn setting off other atoms; thus, producing large amounts of energy.
[17] Stalactites and Stalagmites form due to the precipitation of :
A.
CaCO3
B.
CaCl2
C.
MgCl2
D.
MgCO3
Ans:
CaCO3
Explanation :
Stalactites and stalagmites are formed by water dripping or flowing from fractures on the ceiling of a cave. The dominant mineral in them is calcite (calcium carbonate) or CaCaO3. Their largest displays are formed in caves of limestone and dolomite. Other minerals that may be deposited include other carbonates, opal, chalcedony, limonite, and some sulfides.
[18] Fullerenes form a class of carbon allotropes. The first one to be identified was -
A.
C-59
B.
C-60
C.
C-61
D.
C-69
Ans:
C-60
Explanation :
The first fullerene to be identified was C-60 which has carbon atoms arranged in the shape of a football. Since this looked like the geodesic dome designed by the US architect Buckminster Fuller, the molecule was named fullerene.
[19] Which one of the following is found in Vinegar?
A.
Acetic acid
B.
Propionic acid
C.
Formic acid
D.
Butyric acid
Ans:
Acetic acid
Explanation :
Vinegar is a liquid consisting mainly of acetic acid (CH3COOH) and water. The acetic acid is produced by the fermentation of ethanol by acetic acid bacteria. It is mainly used as a cooking ingredient.
[20] The gas produced in marshy places due to decomposition of vegetation is –
A.
Carbon monoxide
B.
Carbon dioxide
C.
Sulphur dioxide
D.
Methane
Ans:
Methane
Explanation :
Methane gas is a hydrocarbon gas largely composed of methane formed when organic material or vegetation decays in the absence of air. Naturally occurring methane is mainly produced by the process of methanogenesis. It is also known as Swamp Gas.
[21] The chemical name of "Hypo" commonly used in photography is –
A.
Sodium thiosulphate
B.
Silver nitrate
C.
Sodium nitrate
D.
Silver iodide
Ans:
Sodium thiosulphate
Explanation :
An emulsion of sodium thiosulfate is called hypo by photographers. It is used to stop development of exposed film. Thiosulfate converts undeveloped silver bromide grains in the film into water-soluble silver thiosulfate complexes that can be removed when the film is washed.
[22] The process of improving the quality of rubber by heating it with sulphur is called.
A.
Vulcanization
B.
Acceleration
C.
Sulphonation
D.
Galvanization
Ans:
Vulcanization
Explanation :
Vulcanization is a chemical process for converting natural rubber into more durable materials via the addition of sulfur or other equivalent curatives or accelerators. These additives modify the polymer by forming cross-links (bridges) between individual polymer chains.
[23] Which of the following is not a noble gas?
A.
Hydrogen
B.
Helium
C.
Neon
D.
Argon
Ans:
Hydrogen
Explanation :
The noble gases are the chemical elements in group 18 of the periodic table. This chemical series contains helium, neon, argon, krypton, xenon, and radon.
[24] Piped Natural Gas (PNG) is used for –
A.
Mining
B.
Welding
C.
Anaesthesia
D.
Cooking
Ans:
Cooking
Explanation :
PNG is mainly methane - CH4 with a small percentage of other higher hydrocarbons. The ratio of carbon to hydrogen is least in methane and hence it burns almost completely making it the cleanest fuel. Domestic PNG customers, also known as Residential customers, use has for cooking purpose and also for heating water through gas geysers.
[25] Which of the following elements is not present in stainless steel?
A.
Iron
B.
Tungsten
C.
Chromium
D.
Nickel
Ans:
Tungsten
Explanation :
Stainless steel is defined as a steel alloy of iron with a minimum of 10.5% to 11% chromium content by mass. There are different types of stainless steels: when nickel is added, for instance, the austenite structure of iron is stabilized. This crystal structure makes such steels virtually non-magnetic and less brittle at low temperatures.
Explanation :
Phenol is also known as carbolic acid. It is an aromatic organic compound with the molecular formula C6H5OH. Phenol and its chemical derivatives are essential for production of polyearbonates, epoxies, Bakelite, nylon, detergents, herbicides such as phenoxy herbicides, and numerous pharmaceutical drugs.
[16] Atomic explosion is triggered by -
A.
thermo nuclear reaction
B.
chemical reaction
C.
controlled chain reaction
D.
uncontrolled chain reaction
Ans:
uncontrolled chain reaction
Explanation :
During an uncontrolled nuclear chain reaction such as atomic explosion, a radioactive substance gives off energy at a rate that increases rapidly with time, leading to large amounts of radiation and possibly an explosion. The radioactive decay of one atom triggers the decay of some of its neighbors, in turn setting off other atoms; thus, producing large amounts of energy.
[17] Stalactites and Stalagmites form due to the precipitation of :
A.
CaCO3
B.
CaCl2
C.
MgCl2
D.
MgCO3
Ans:
CaCO3
Explanation :
Stalactites and stalagmites are formed by water dripping or flowing from fractures on the ceiling of a cave. The dominant mineral in them is calcite (calcium carbonate) or CaCaO3. Their largest displays are formed in caves of limestone and dolomite. Other minerals that may be deposited include other carbonates, opal, chalcedony, limonite, and some sulfides.
[18] Fullerenes form a class of carbon allotropes. The first one to be identified was -
A.
C-59
B.
C-60
C.
C-61
D.
C-69
Ans:
C-60
Explanation :
The first fullerene to be identified was C-60 which has carbon atoms arranged in the shape of a football. Since this looked like the geodesic dome designed by the US architect Buckminster Fuller, the molecule was named fullerene.
[19] Which one of the following is found in Vinegar?
A.
Acetic acid
B.
Propionic acid
C.
Formic acid
D.
Butyric acid
Ans:
Acetic acid
Explanation :
Vinegar is a liquid consisting mainly of acetic acid (CH3COOH) and water. The acetic acid is produced by the fermentation of ethanol by acetic acid bacteria. It is mainly used as a cooking ingredient.
[20] The gas produced in marshy places due to decomposition of vegetation is –
A.
Carbon monoxide
B.
Carbon dioxide
C.
Sulphur dioxide
D.
Methane
Ans:
Methane
Explanation :
Methane gas is a hydrocarbon gas largely composed of methane formed when organic material or vegetation decays in the absence of air. Naturally occurring methane is mainly produced by the process of methanogenesis. It is also known as Swamp Gas.
[21] The chemical name of "Hypo" commonly used in photography is –
A.
Sodium thiosulphate
B.
Silver nitrate
C.
Sodium nitrate
D.
Silver iodide
Ans:
Sodium thiosulphate
Explanation :
An emulsion of sodium thiosulfate is called hypo by photographers. It is used to stop development of exposed film. Thiosulfate converts undeveloped silver bromide grains in the film into water-soluble silver thiosulfate complexes that can be removed when the film is washed.
[22] The process of improving the quality of rubber by heating it with sulphur is called.
A.
Vulcanization
B.
Acceleration
C.
Sulphonation
D.
Galvanization
Ans:
Vulcanization
Explanation :
Vulcanization is a chemical process for converting natural rubber into more durable materials via the addition of sulfur or other equivalent curatives or accelerators. These additives modify the polymer by forming cross-links (bridges) between individual polymer chains.
[23] Which of the following is not a noble gas?
A.
Hydrogen
B.
Helium
C.
Neon
D.
Argon
Ans:
Hydrogen
Explanation :
The noble gases are the chemical elements in group 18 of the periodic table. This chemical series contains helium, neon, argon, krypton, xenon, and radon.
[24] Piped Natural Gas (PNG) is used for –
A.
Mining
B.
Welding
C.
Anaesthesia
D.
Cooking
Ans:
Cooking
Explanation :
PNG is mainly methane - CH4 with a small percentage of other higher hydrocarbons. The ratio of carbon to hydrogen is least in methane and hence it burns almost completely making it the cleanest fuel. Domestic PNG customers, also known as Residential customers, use has for cooking purpose and also for heating water through gas geysers.
[25] Which of the following elements is not present in stainless steel?
A.
Iron
B.
Tungsten
C.
Chromium
D.
Nickel
Ans:
Tungsten
Explanation :
Stainless steel is defined as a steel alloy of iron with a minimum of 10.5% to 11% chromium content by mass. There are different types of stainless steels: when nickel is added, for instance, the austenite structure of iron is stabilized. This crystal structure makes such steels virtually non-magnetic and less brittle at low temperatures.
Explanation :
Stalactites and stalagmites are formed by water dripping or flowing from fractures on the ceiling of a cave. The dominant mineral in them is calcite (calcium carbonate) or CaCaO3. Their largest displays are formed in caves of limestone and dolomite. Other minerals that may be deposited include other carbonates, opal, chalcedony, limonite, and some sulfides.
[18] Fullerenes form a class of carbon allotropes. The first one to be identified was -
A.
C-59
B.
C-60
C.
C-61
D.
C-69
Ans:
C-60
Explanation :
The first fullerene to be identified was C-60 which has carbon atoms arranged in the shape of a football. Since this looked like the geodesic dome designed by the US architect Buckminster Fuller, the molecule was named fullerene.
[19] Which one of the following is found in Vinegar?
A.
Acetic acid
B.
Propionic acid
C.
Formic acid
D.
Butyric acid
Ans:
Acetic acid
Explanation :
Vinegar is a liquid consisting mainly of acetic acid (CH3COOH) and water. The acetic acid is produced by the fermentation of ethanol by acetic acid bacteria. It is mainly used as a cooking ingredient.
[20] The gas produced in marshy places due to decomposition of vegetation is –
A.
Carbon monoxide
B.
Carbon dioxide
C.
Sulphur dioxide
D.
Methane
Ans:
Methane
Explanation :
Methane gas is a hydrocarbon gas largely composed of methane formed when organic material or vegetation decays in the absence of air. Naturally occurring methane is mainly produced by the process of methanogenesis. It is also known as Swamp Gas.
[21] The chemical name of "Hypo" commonly used in photography is –
A.
Sodium thiosulphate
B.
Silver nitrate
C.
Sodium nitrate
D.
Silver iodide
Ans:
Sodium thiosulphate
Explanation :
An emulsion of sodium thiosulfate is called hypo by photographers. It is used to stop development of exposed film. Thiosulfate converts undeveloped silver bromide grains in the film into water-soluble silver thiosulfate complexes that can be removed when the film is washed.
[22] The process of improving the quality of rubber by heating it with sulphur is called.
A.
Vulcanization
B.
Acceleration
C.
Sulphonation
D.
Galvanization
Ans:
Vulcanization
Explanation :
Vulcanization is a chemical process for converting natural rubber into more durable materials via the addition of sulfur or other equivalent curatives or accelerators. These additives modify the polymer by forming cross-links (bridges) between individual polymer chains.
[23] Which of the following is not a noble gas?
A.
Hydrogen
B.
Helium
C.
Neon
D.
Argon
Ans:
Hydrogen
Explanation :
The noble gases are the chemical elements in group 18 of the periodic table. This chemical series contains helium, neon, argon, krypton, xenon, and radon.
[24] Piped Natural Gas (PNG) is used for –
A.
Mining
B.
Welding
C.
Anaesthesia
D.
Cooking
Ans:
Cooking
Explanation :
PNG is mainly methane - CH4 with a small percentage of other higher hydrocarbons. The ratio of carbon to hydrogen is least in methane and hence it burns almost completely making it the cleanest fuel. Domestic PNG customers, also known as Residential customers, use has for cooking purpose and also for heating water through gas geysers.
[25] Which of the following elements is not present in stainless steel?
A.
Iron
B.
Tungsten
C.
Chromium
D.
Nickel
Ans:
Tungsten
Explanation :
Stainless steel is defined as a steel alloy of iron with a minimum of 10.5% to 11% chromium content by mass. There are different types of stainless steels: when nickel is added, for instance, the austenite structure of iron is stabilized. This crystal structure makes such steels virtually non-magnetic and less brittle at low temperatures.
Explanation :
Vinegar is a liquid consisting mainly of acetic acid (CH3COOH) and water. The acetic acid is produced by the fermentation of ethanol by acetic acid bacteria. It is mainly used as a cooking ingredient.
[20] The gas produced in marshy places due to decomposition of vegetation is –
A.
Carbon monoxide
B.
Carbon dioxide
C.
Sulphur dioxide
D.
Methane
Ans:
Methane
Explanation :
Methane gas is a hydrocarbon gas largely composed of methane formed when organic material or vegetation decays in the absence of air. Naturally occurring methane is mainly produced by the process of methanogenesis. It is also known as Swamp Gas.
[21] The chemical name of "Hypo" commonly used in photography is –
A.
Sodium thiosulphate
B.
Silver nitrate
C.
Sodium nitrate
D.
Silver iodide
Ans:
Sodium thiosulphate
Explanation :
An emulsion of sodium thiosulfate is called hypo by photographers. It is used to stop development of exposed film. Thiosulfate converts undeveloped silver bromide grains in the film into water-soluble silver thiosulfate complexes that can be removed when the film is washed.
[22] The process of improving the quality of rubber by heating it with sulphur is called.
A.
Vulcanization
B.
Acceleration
C.
Sulphonation
D.
Galvanization
Ans:
Vulcanization
Explanation :
Vulcanization is a chemical process for converting natural rubber into more durable materials via the addition of sulfur or other equivalent curatives or accelerators. These additives modify the polymer by forming cross-links (bridges) between individual polymer chains.
[23] Which of the following is not a noble gas?
A.
Hydrogen
B.
Helium
C.
Neon
D.
Argon
Ans:
Hydrogen
Explanation :
The noble gases are the chemical elements in group 18 of the periodic table. This chemical series contains helium, neon, argon, krypton, xenon, and radon.
[24] Piped Natural Gas (PNG) is used for –
A.
Mining
B.
Welding
C.
Anaesthesia
D.
Cooking
Ans:
Cooking
Explanation :
PNG is mainly methane - CH4 with a small percentage of other higher hydrocarbons. The ratio of carbon to hydrogen is least in methane and hence it burns almost completely making it the cleanest fuel. Domestic PNG customers, also known as Residential customers, use has for cooking purpose and also for heating water through gas geysers.
[25] Which of the following elements is not present in stainless steel?
A.
Iron
B.
Tungsten
C.
Chromium
D.
Nickel
Ans:
Tungsten
Explanation :
Stainless steel is defined as a steel alloy of iron with a minimum of 10.5% to 11% chromium content by mass. There are different types of stainless steels: when nickel is added, for instance, the austenite structure of iron is stabilized. This crystal structure makes such steels virtually non-magnetic and less brittle at low temperatures.
Explanation :
An emulsion of sodium thiosulfate is called hypo by photographers. It is used to stop development of exposed film. Thiosulfate converts undeveloped silver bromide grains in the film into water-soluble silver thiosulfate complexes that can be removed when the film is washed.
[22] The process of improving the quality of rubber by heating it with sulphur is called.
A.
Vulcanization
B.
Acceleration
C.
Sulphonation
D.
Galvanization
Ans:
Vulcanization
Explanation :
Vulcanization is a chemical process for converting natural rubber into more durable materials via the addition of sulfur or other equivalent curatives or accelerators. These additives modify the polymer by forming cross-links (bridges) between individual polymer chains.
[23] Which of the following is not a noble gas?
A.
Hydrogen
B.
Helium
C.
Neon
D.
Argon
Ans:
Hydrogen
Explanation :
The noble gases are the chemical elements in group 18 of the periodic table. This chemical series contains helium, neon, argon, krypton, xenon, and radon.
[24] Piped Natural Gas (PNG) is used for –
A.
Mining
B.
Welding
C.
Anaesthesia
D.
Cooking
Ans:
Cooking
Explanation :
PNG is mainly methane - CH4 with a small percentage of other higher hydrocarbons. The ratio of carbon to hydrogen is least in methane and hence it burns almost completely making it the cleanest fuel. Domestic PNG customers, also known as Residential customers, use has for cooking purpose and also for heating water through gas geysers.
[25] Which of the following elements is not present in stainless steel?
A.
Iron
B.
Tungsten
C.
Chromium
D.
Nickel
Ans:
Tungsten
Explanation :
Stainless steel is defined as a steel alloy of iron with a minimum of 10.5% to 11% chromium content by mass. There are different types of stainless steels: when nickel is added, for instance, the austenite structure of iron is stabilized. This crystal structure makes such steels virtually non-magnetic and less brittle at low temperatures.
Explanation :
The noble gases are the chemical elements in group 18 of the periodic table. This chemical series contains helium, neon, argon, krypton, xenon, and radon.
[24] Piped Natural Gas (PNG) is used for –
A.
Mining
B.
Welding
C.
Anaesthesia
D.
Cooking
Ans:
Cooking
Explanation :
PNG is mainly methane - CH4 with a small percentage of other higher hydrocarbons. The ratio of carbon to hydrogen is least in methane and hence it burns almost completely making it the cleanest fuel. Domestic PNG customers, also known as Residential customers, use has for cooking purpose and also for heating water through gas geysers.
[25] Which of the following elements is not present in stainless steel?
A.
Iron
B.
Tungsten
C.
Chromium
D.
Nickel
Ans:
Tungsten
Explanation :
Stainless steel is defined as a steel alloy of iron with a minimum of 10.5% to 11% chromium content by mass. There are different types of stainless steels: when nickel is added, for instance, the austenite structure of iron is stabilized. This crystal structure makes such steels virtually non-magnetic and less brittle at low temperatures.
Explanation :
Stainless steel is defined as a steel alloy of iron with a minimum of 10.5% to 11% chromium content by mass. There are different types of stainless steels: when nickel is added, for instance, the austenite structure of iron is stabilized. This crystal structure makes such steels virtually non-magnetic and less brittle at low temperatures.