1) What is "milk of magnesia" chemically?
Answer
Magnesium hydroxide
2) The acid used in lead storage cells is –
Answer
sulphuric acid
3) Milk tastes sour when kept in the open for sometime due to the formation of –
Answer
lactic acid
4) The ratio of pure gold in 18 carat gold is –
Answer
0.75
5) is the process in which acids and bases react to form salts and water.
Answer
Neutralization
6) The gas usually causing explosions in coal mines is –
Answer
Methane
7) Which is the purest form of iron?
Answer
Wrought iron
8) Petroleum is a mixture of –
Answer
hydrocarbons
9) The gas used for filling weather balloons is –
Answer
helium
10) An emulsion is a colloid of a –
Answer
liquid in a liquid
11) Percentage of carbon in steel ranges from –
Answer
0.1 to 1.5
12) Candle is a mixture of –
Answer
Paraffin was and stearic acid
13) German silver, an alloy, does not contain the metal –
Answer
Silver
14) Oxygen which is vital for life is a product of photosynthesis and comes from –
Answer
water
15) What is the purpose of adding baking soda to dough?
Answer
To generate carbon dioxide
16) Gobar gas mainly contains –
Answer
Methane
17) The chief constituent of vinegar is –
Answer
Acetic acid
18) Commercial Vaseline is derived from -
Answer
petroleum
19) Colour imparted to the Bunsen flame by strontium salt is -
Answer
crimson red
20) Name the particle that is most essential to continue the chain reaction during the fission of uranium -
Answer
Neutron
21) The element used in the manufacture of safety matches is –
Answer
Phosphorous
22) The main source of Naphthalene is -
Answer
Coal-tar
23) The material used in solar cells contains -
Answer
Silicon
24) Quartz is a crystalline form of -
Answer
Silica
25) In vulcanisation process, rubber can be hardened by adding -
Answer
Sulphur
26) Urea is a -
Answer
Nitrogenous fertilizer
27) During inter conversion of energy from one form to other forms, total energy at any time remains–
Answer
constant
28) Sea weeds are important source of –
Answer
iodine
29) Which gas is used to manufacture vanaspati from vegetable oil is -
Answer
hydrogen
30) The pH of a neutral solution is -
Answer
7
31) The nucleus of an atom consists of -
Answer
protons and neutrons
32) Detergents are –
Answer
Sodium salts of sulphonic acids
33) The noble gas used in radiotherapy is –
Answer
radon
34) Ethanol containing 5% water is known as –
Answer
rectified spirit
35) The important ore of aluminium is –
Answer
bauxite
36) The major harmful gas emitted by automobile vehicles which causes air pollution is –
Answer
Carbon Monoxide
37) Who discovered the atom bomb?
Answer
Otto Hahn
38) The major component of honey is -
Answer
fructose
39) A body moving in a circular path with a constant speed has a -
Answer
constant kinetic energy
40) is a multibranched polysaccharide of glucose that serves as a form of energy storage in animals and fungi.
Answer
Glycogen
41) Potassium Permanganate is used for purifying drinking water, because -
Answer
It is an oxidising agent
42) Diamond is harder than graphite because of –
Answer
difference in layers of atoms
43) Gobar gas contains mainly –
Answer
methane
44) What is the most commonly used substance in fluorescent tubes?
Answer
Mercury vapour and argon
45) Soap is prepared by boiling caustic soda with –
Answer
Fats
46) Bronze is an alloy of –
Answer
Copper and Tin
47) The gas used for artificial fruit ripening of green fruit is –
Answer
Ethylene
48) Manganite is an ore/mineral of .
Answer
Manganese
49) The freezing point of fresh water is -
Answer
0°C
50) is used for making vinegar.
Answer
Acetic acid
51) The most reactive among the halogens is -
Answer
Fluorine
52) What material is used to make electric heater coil?
Answer
Nichrome
53) Pasteurisation is the process in which milk is heated to –
Answer
63°C for 30 minutes
54) What is the maximum Water Vapour content in the atmosphere?
Answer
3 to 4 per cent
55) Steel contains –
Answer
0.1 - 2% carbon
56) The chemicals most commonly used for cloud seeding or artificial rainmaking' is/are –
Answer
Silver Iodide
57) The Refrigerant 'FREON' is –
Answer
Difluoro Dichloro Methane
58) is the number of shells for elements of the 3rd period.
Answer
0
59) The nucleus of an atom consists of -
Answer
protons and neutrons
60) The isotope of Uranium capable of sustaining chain reaction is -
Answer
U-235
61) Conversion of chemical energy into electrical energy occurs in -
Answer
A battery
62) The fuel that is used in modern submarines is –
Answer
Nuclear fuel
63) When lime juice is dropped on baking soda, brisk effervescence takes place because the gas evolved is -
Answer
Carbon dioxide
64) In the electroplating of gold, the electrolyte used is –
Answer
Gold sulphate
65) The basic chemical building block of natural rubber obtained from trees is –
Answer
Isoprene
66) The name of plastic polymer from which combs, toys, bowls etc., can be made, is –
Answer
Polystyrene
67) 'Red Ink' is prepared from -
Answer
Eosin
68) Gas released during Bhopal tragedy was -
Answer
Methyl isothiocyanate
69) Oil of vitriol is -
Answer
sulfuric acid
70) Hydrogen was discovered by -
Answer
Cavendish
71) Glass is a –
Answer
supercooled liquid
72) Uranium eventually decays into a stable isotope of —
Answer
Lead
73) The substance that is added to make natural rubber strong and more bouncy is –
Answer
Sulphur
74) White phosphorus is always kept under –
Answer
water
75) The amount of Chlorine available in water after disinfection is called as –
Answer
residual chlorine
76) What are the major pollutants of cigarette smoke?
Answer
Carbon monoxide and nicotine
77) The chemical name of 'Common salt' is –
Answer
Sodium chloride
78) By-product obtained by soap industry is –
Answer
Glycerol
79) Polythene is polymer of –
Answer
Ethylene
80) Which one is not micronutrient?
Answer
Sulphur
81) Who suggested that the most of the mass of atom is located in nucleus?
Answer
Rutherford
82) Ginger is an example of -
Answer
Modified Stem
83) The ore which is found in abundance in India is -
Answer
monazite
84) Baryllium Sulphate is less soluble in water due to –
Answer
High inflammable energy
85) Heat resistant variety of glass is –
Answer
Flint glass
86) The natural source of hydro-carbon is –
Answer
Crude oil
87) What is the name of that system, which uses radioactivity to decide the period of materials of-pre- historic period?
Answer
Carbon dating
88) Cement is made hard with –
Answer
hydration and dissociation of water
89) Which acid is used in rubber, textile, leather and electroplating industries?
Answer
Methanoic acid
90) Study of Fossils is known as?
Answer
Paleontology
91) A substance which readily forms colloidal solution in contact with water is called –
Answer
Hydrophilic colloid
92) Denatured spirit is ethanol mixed with –
Answer
Pyridine
93) The most abundant inert gas in the atmosphere is –
Answer
Argon
94) Nuclear energy is a mineral-based energy source. It is derived from –
Answer
uranium
95) Zinc sulphide is commonly used as –
Answer
rodenticide
96) Galena is a mineral of –
Answer
lead
97) Magnalium is an alloy of –
Answer
Aluminium and Magnesium
98) Which of the toxic heavy metals is found in modern tannery industries?
Answer
Chromium
99) Carbon reacts with metal to form -
Answer
Carbide
100) Radioactive disintegration of Uranium ultimately results in formation of -
Answer
Lead
101) Energy use in solar cookers, solar distillation plants, solar power plants is known as –
Answer
solar energy
102) 'Vinegar' is a commercial name of –
Answer
Acetic acid
103) Which metal does not undergo corrosion due to the formation of oxide layer?
Answer
Aluminium
104) The acid present in red ants is –
Answer
Formic acid
105) The metal extracted from Bauxite is –
Answer
Aluminum
106) pH value between 6.5-7.5 makes the soil -
Answer
None of these
107) The metal chiefly used for galvanizing iron is:
Answer
Zine
108) Submarines move under water. They have engines that run on -
Answer
Diesel
109) The Bhopal gas tragedy was caused by the gas -
Answer
Methyl Iso Cyanate
110) The wine is prepared by the process of -
Answer
fermentation
111) Fission and fusion are called -
Answer
nuclear reactions
112) Who discovered electron?
Answer
J. J. Thomson
113) Galvanization of iron is carried out using –
Answer
Zinc
114) Cokking gas is a mixture of -
Answer
butane and propane
115) The purest form of water is –
Answer
rain water
116) The main constituent of biogas is –
Answer
methane
117) Which metal is extracted from sea water?
Answer
Magnesium
118) Percentage of lead in lead pencils is –
Answer
0
119) When formaldehyde and potassium hydroxide are heated, we get –
Answer
Methyl alcohol
120) When conc. H2SO4 is added to diy KNO3, brown fumes are evolved. These fumes are due to –
Answer
NO2
121) Pasteurisation of milk means –
Answer
heating of milk to above 62°C
122) Aluminium can be purified by –
Answer
electrolysis
123) Non-metallic oxides are in nature.
Answer
Acidic
124) Detergents used for cleaning clothes and utensils contain –
Answer
sulphonates
125) Radioactive disintegration of uranium ultimately results in formation of –
Answer
lead
126) Impure camphor is purified by –
Answer
sublimation
127) Greenhouse effect is caused by –
Answer
carbon dioxide
128) The polymer used in making plastic crockery is –
Answer
Melamine
129) Vulcanization of rubber is carried out by adding –
Answer
Sulphur
130) Helium gas is used in gas balloons instead of hydrogen gas because it is –
Answer
non-combustible
131) Aspirin is chemically known as –
Answer
acetylsalicylic acid
132) The most abundant element in the human body is –
Answer
oxygen
133) Dry powder fire extinguishers contain -
Answer
sand and sodium bicarbonate
134) Which type of glass is used for making glass reinforced plastic?
Answer
Fibre glass
135) Who invented radar?
Answer
A H Taylor and Leo C Young
136) What is the common characteristic of the elements of the same group in the periodic table?
Answer
Electrons in outer most shell
137) The fiber least prone to catch fire is –
Answer
cotton
138) Polythene is industrially prepared by the polymerization of -
Answer
Ethylene
139) Molasses a by-product in the manufacture of sugar, is converted into -
Answer
alcohol
140) The wire of flash bulb is made of :
Answer
Magnesium
141) The coloured discharge tubes for advertisement mainly contain -
Answer
Neon
142) Muscle fatigue is caused by the accumulation of :
Answer
Lactic acid
143) Baking soda is:
Answer
Sodium bicarbonate
144) Which of these acids is not organic in origin?
Answer
Sulphuric acid
145) A mixture of water and alcohol can be separated by -
Answer
Distillation
146) Setting of plaster of Paris involves –
Answer
hydration to form other hydrates
147) The common name for the com-pound having formal NaOH is –
Answer
Caustic soda
148) Energy stored in a coal is -
Answer
chemical energy
149) Two elements which are used to absorb neutrons to control the chain reaction during nuclear fission are -
Answer
Boron and Cadmium
150) The most commonly used chemicals in the artificial rainmaking or cloud seeding are –
Answer
Silver Iodide (AgI)
151) Wax used for making candle is chemically a mixture of –
Answer
aliphatic hydrocarbons
152) The gas used in the artificial ripening of fruits is –
Answer
Acetylene
153) Ruby and sapphire are oxides of –
Answer
aluminium
154) Smoke is formed due to –
Answer
Solid dispersed in gas
155) Type metal used in printing press is an alloy of –
Answer
lead and antimony
156) Sour taste of 'Coca Cola' is due to the presence of –
Answer
phosphoric acid
157) German silver is an alloy of –
Answer
zinc, copper and nickel
158) Acids turn blue litmus into which color?
Answer
Red
159) Haemoglobin is used to transport in humans.
Answer
Oxygen
160) Commercial nitric acid is coloured because it contains dissolved –
Answer
Nitrogen dioxide
161) Fertiliser having high nitrogen content is –
Answer
Ammonium nitrate
162) Bhopal has tragedy is associated with leakage of –
Answer
methyl isocyanate
163) Nucleus of an atom consists of.
Answer
Proton and Neutron
164) Where does the oxygen that keeps us alive come from?
Answer
Water
165) The gas used for artificial fruit ripening of green fruit is –
Answer
Ethylent
166) Magnets attract magnetic substances are iron, nickel, cobalt, etc. They can also repel -
Answer
diamagnetic substances
167) Atomic mass of Sulphur is 32u. The number of moles in 16 games of Sulphur is:
Answer
0.5 moles of Sulphur
168) A metal is exposed to the atmosphere for some time. It becomes coated with green carbonate. The metal must be –
Answer
copper
169) Iodized salt is beneficial for –
Answer
thyroid function
170) Fungi are plants that lack -
Answer
Chlorophyll
171) Gunpowder consits of a mixture of –
Answer
nitre, sulphur and charcoal
172) Litmus is obtained from –
Answer
lichen
173) Vinegar made by fermentation from cane sugar contains –
Answer
acetic acid
174) Hydrogen bomb is based on the principle of –
Answer
uncontrolled fusion reaction
175) Rare gases are -
Answer
Mono atomic
176) Bone ash contains -
Answer
Calcium phosphate
177) The hardest substance available in earth is –
Answer
Diamond
178) A potato tuber has been cut into two halves. A few drops of iodine solution are placed on the cut surface of one of the halves. What colour change will be noticed?
Answer
From brown to blue-black
179) Lead pencil contains –
Answer
graphite
180) Solder is an alloy of –
Answer
tin, lead
181) What is the most common salt in sea water?
Answer
Sodium chloride
182) When quick lime is added to water
Answer
heat is liberated
183) The number of neutrons present in an element having mass number 226 and atomic number 88 is–
Answer
138
184) The atomic number of hydrogen is 1. This implies that it contains in its K-shell.
Answer
One electron
185) Name two elements that find wide application in transistor industry –
Answer
Silicon and Germanium
186) The energy of the sun is mainly due to -
Answer
nuclear fusion
187) Tear gas used by the police to disperse the mob contains -
Answer
Chlorine
188) Epsom salt is used -
Answer
as purgative
189) The ratio of pure gold in 18 carat gold is -
Answer
0.75
190) Oil of vitriol is -
Answer
sulfuric acid
191) The number of electrons in the outer shell of the most stable or inert atoms is .
Answer
8
192) Supersonic jet causes pollution by thinning of -
Answer
O3 layer
193) Which type of glass is used for making glass reinforced plastic?
Answer
Fibre glass
194) Photoxidation process is initiated by –
Answer
light
195) Ultraviolet radiation striking the earth is due to the depletion of –
Answer
ozone
196) In nuclear reactors, graphite is used as a/an –
Answer
moderator
197) Sea water can be purified by the process of –
Answer
distillation
198) Which is/ are the important raw materials in cement industry?
Answer
Limestone and Clay
199) The father of modern chemistry is –
Answer
Lavoisier
200) The acid rain destroys vegetations because it contains –
Answer
sulphuric acid
201) Diamonds are glittering and attractive because light incident on them undergoes –
Answer
multiple internal reflections
202) On heating, Gypsum loses certain percentage of its water content and becomes -
Answer
Plaster of Paris
203) What is the element required for solar energy conversion?
Answer
Silicon
204) What is the chemical name for `Baking Soda'?
Answer
Sodium bicarbonate
205) The first metal used by a man was –
Answer
Copper
206) The substance most commonly used as a food preservative is –
Answer
sodium salt of benzoic acid
207) Detergents clean surfaces on the principle of –
Answer
surface tension
208) Galvanised iron is made by coating iron with –
Answer
Zinc
209) An atomic pile is used for –
Answer
conducting nuclear fission
210) The compound to which H2 does not add is –
Answer
Tetraphenyl ethylene
211) Major gaseous pollutant of the thermal power station is –
Answer
SO2
212) The process of removing calcium and magnesium from hard water is known as –
Answer
Water softening
213) Which is used in preparation of dynamite?
Answer
glycerol
214) Vinegar is the trade name of -
Answer
acetic acid
215) Acid secretion is characteristic of -
Answer
Stomach
216) The common refrigerant in domestic refrigerator is -
Answer
Freon
217) The chemical name of “laughing gas” is -
Answer
Nitrous oxide
218) Bleaching action of chlorine is by -
Answer
oxidation
219) Hardest material is -
Answer
Diamond
220) When iron rusts, its weight -
Answer
increases
221) Two elements which can form a large number of compounds are
Answer
Carbon and Hydrogen
222) An inert gas mixed with oxygen given to patients suffering from restricted breathing is –
Answer
Helium
223) Brass is an alloy of -
Answer
Zine and copper
224) The chemical name of rat poison is -
Answer
zinc phosphide
225) Slag is a name given for -
Answer
molten alumina
226) Stainless steel is an alloy of -
Answer
chromium, carbon and iron
227) For generation of biogas, the materials commonly used are —
Answer
Animal wastes
228) The tip of the match-stick contains –
Answer
red phosphorus
229) Commercially, sodium bicarbonate is known as –
Answer
Baking soda
230) Which gas does not form the part, of atmosphere?
Answer
Chlorine
231) The reaction between an acid and a base to give a salt and water is known as a -
Answer
Neutralisation reaction
232) Electron affinity of noble gases is -
Answer
zero
233) Curd is sour due to presence of –
Answer
Lactic acid
234) Tear gas is –
Answer
Carbonyl chloride
235) Saccharin is made up of –
Answer
Toluene
236) PVC is obtained by the polymerisation of –
Answer
Vinyl chloride
237) The substance which does not expand on going from liquid state to solid state is –
Answer
Type metal
238) Isobars are lines joining places having equal –
Answer
Pressure
239) Global warming is mainly due to accumulation of –
Answer
Carbon dioxide
240) Which is abundant in Gobar gas?
Answer
Methane
241) The most suitable vessel for storing concentrated sulphuric acid is –
Answer
Glass vessel
242) The radioactive element used in heart pacemakers is –
Answer
Uranium
243) The element which is commonly used in nuclear for producing electricity by nuclear fission is –
Answer
Uranium
244) A mixture of benzene and toluene forms -
Answer
Ideal solution
245) The aqueous solution of which acids is called Vinegar -
Answer
Acetic acid
246) What happens to its potential energy when an object is taken to high altitude?
Answer
Its potential energy increases
247) The fuel used in an atomic reactor is –
Answer
Uranium
248) Mortar is a mixture of water sand and –
Answer
Slaked lime
249) The element which is used for vulcanizing rubber –
Answer
Sulphur
250) Raw materials used for the manufacture of glass are –
Answer
sand, soda, limestone
251) Stainless steel is usually made by alloying the steel with –
Answer
chromium and nickel
252) Electrons in the highest energy level of an atom are called _.
Answer
valence electrons
253) Bromine is-
Answer
A red liquid
254) Which is not a type of elements?
Answer
Metalloids
255) The nuclear particles which are assumed to hold the nucleons together are -
Answer
mesons
256) Milk of magnesia is a suspension of –
Answer
magnesium hydroxide
257) Minamata disease is a nervous disorder caused by eating fish, polluted with .
Answer
Mercury
258) The charcoal used to decolorize brown sugar solution is -
Answer
Animal charcoal
259) The coating of a thin layer of zinc on steel or iron objects is known as –
Answer
Galvanising
260) The National Chemical Laboratory (India) is located in –
Answer
Pune
261) The major constituent of gobar gas is –
Answer
Methane
262) The residue left after extracting juice from sugar beet and sugarcane is called –
Answer
bagasse
263) Indane gas is a mixture of which gases?
Answer
butane and propane
264) Nuclear fission is caused by the impact of -
Answer
Neutron
265) Acid rain is due to air pollution by -
Answer
Nitrous oxide and Sulfur dioxide
266) Milk is a natural –
Answer
Emulsion
267) A polymeric substance used to make parachute is –
Answer
Viscose
268) The metallic Constituents of hard water are –
Answer
Calcium, magnesium and iron
269) The pH of human blood is between –
Answer
7.5-8
270) What is the element that is in the highest percentage in the composition of the earth?
Answer
Oxygen
271) Formation of ozone hole is maximum over –
Answer
Antarctica
272) Drinking soda is –
Answer
Acidic
273) The cathode of a lead storage battery is made up of –
Answer
Lead
274) Who is regarded as father of modern chemistry?
Answer
Lavoisier
275) What is the principal ore of aluminium?
Answer
Bauxite
276) Which gas is used as fire extinguisher?
Answer
Carbon dioxide
277) The isotope of Uranium used in atomic reactors is –
Answer
U^235
278) The anode in a dry cell consists of –
Answer
Zinc
279) Aspirin is common name of –
Answer
Acetyl Salicylic Acid
280) The constituents of automobile exhaust that can cause cancer is/are :
Answer
Carbon monoxide
281) Hard steel contains –
Answer
0.5 to 1.5 per cent carbon
282) The metals commonly used for electroplating are –
Answer
Chromium, Copper and Nickel
283) Which type of radiations are absorbed by the upper layer of the atmosphere?
Answer
Ultraviolet
284) The gas which is mainly responsible for the green house effect is:
Answer
Carbon dioxide
285) Name the gas which is used in balloons in the place of hydrogen?
Answer
helium
286) The temperature at which both the Fahrenheit and Centigrade scales have the same value is –
Answer
-40°
287) The natural resource, known as black gold is –
Answer
coal
288) This group of alumino-silicate minerals is widely used in making electrical insulators –
Answer
Mica
289) The rate of change of linear momentum of a body falling freely under gravity is equal to it's .
Answer
Weight
290) The main Constituent of natural gas is –
Answer
Methane
291) Domestic cooking gas consists mostly of –
Answer
liquefied butane and isobutene
292) An example of replenshible energy source is —
Answer
Biomass
293) Bleaching powder is used in drinking water as a/an –
Answer
disinfectant
294) The iron ore which contains 72% of iron is –
Answer
Magnetite
295) Cement is formed by strongly heating a mixture of –
Answer
limestone and clay
296) Glass is a –
Answer
supercooled liquid
297) Ozone consists of -
Answer
Oxygen only
298) The greenhouse effect is caused by the higher level of which gas in the atmosphere?
Answer
Carbon dioxide
299) Natural rubber is a polymer derived from -
Answer
isoprene
300) The most reactive among the halogens is -
Answer
Fluorine
301) When iron rusts, its weight :
Answer
increases
302) The enzyme that converts glucose to ethyl alcohol is –
Answer
Zymase
303) Who developed Hydrogen Bomb?
Answer
Edward Teller
304) The fundamental particles present in the nucleus of an atom are -
Answer
Proton, neutron
305) Bleaching action of moist sulphur dioxide is because of its –
Answer
oxidising property
306) The long range potential of nuclear energy in India depends on its reserves of –
Answer
uranium
307) Silk fibre chemically is –
Answer
Protein
308) Milk tastes sour when it is left in open for some time. This happens due to the formation of –
Answer
Lactic acid
309) Who proposed first atomic theory?
Answer
John Dalton
310) The major constituent of air is –
Answer
nitrogen
311) Cream gets separated out of milk when it is churned. This is due to–
Answer
centrifugal force
312) Lime water turns milky when carbon dioxide is passed through it. It is due to the formation of:
Answer
Calcium Carbonate
313) German silver is an alloy of -
Answer
zinc, copper and nickel
314) One of the constituents of tear gas is -
Answer
Chloropicrin
315) An atomic clock is based on transitions in -
Answer
Caesium
316) The temperature of oxyacetylene flame is around –
Answer
3200°C
317) What product is formed when electricity is passed through an aqueous solution of sodium chloride?
Answer
Sodium hydroxide
318) The atmospheric gas that is mainly responsible for Green House effect –
Answer
Carbondioxide
319) Tar roads get damaged if there is –
Answer
stagnation of water on road
320) The drug 'Marijuana' is a –
Answer
sedative
321) Chemically 'Quick Silver’ is known as –
Answer
Mercury
322) Extensively used nitrogenous fertilizer is –
Answer
Urea
323) The metal used in storage batteries-
Answer
Lead
324) Type metal used in printing press is an alloy of -
Answer
lead and antimony
325) The acid which is secreted by the glands in the stomach wall is –
Answer
hydrochloric acid
326) Dry ice is –
Answer
solid carbon dioxide
327) Cement containing excess amount of lime –
Answer
cracks during setting
328) In vulcanization, natural rubber is heated with-
Answer
Sulphur
329) An example of major air pollutant is –
Answer
Carbon monoxide
330) The metal, used to galvanise iron to protect it from rusting is -
Answer
Zine
331) The material known in commerce as Terylene is a –
Answer
Synthetic fibre
332) Among the fuels given below, the one with highest calorific value is –
Answer
Natural gas
333) Electric bulbs are filled with –
Answer
Argon
334) The purest form of Iron is :
Answer
Wrought iron
335) Atomic mass of Nitrogen is 14 and that of Hydrogen is 1. What will be the molecular mass of Ammonia?
Answer
17
336) Silver halides are used in photographic plates because they are -
Answer
reduced by light
337) Tetra ethyle lead (TEL) is -
Answer
an antiknock compound
338) Which metal is heaviest -
Answer
osmium
339) The term PVC used in the plastic industry stands for -
Answer
polyvinyl chloride
340) Rusting of iron takes place due to –
Answer
oxidation
341) German silver used for making utensils is an alloy of –
Answer
Copper, zinc, nickel
342) Sour milk contains –
Answer
lactic acid
343) The acid used in lead storage cells is –
Answer
sulphuric acid
344) Milk is an example of -
Answer
emulsion
345) Alum stops bleeding in minor cuts because of –
Answer
coagulation
346) 'Plaster of Paris' is made by partial dehydration of –
Answer
gypsum salt
347) The purity of gold is expressed in carats. The purest form of gold is–
Answer
24 carats
348) Petroleum consists of a mixture of –
Answer
Hydrocarbons
349) What is a mixture of potassium nitrate powdered charcoal and sulfur called?
Answer
gun powder
350) The isotope used for the production of atomic energy is -
Answer
U-235
351) Which of the metallic ions is essential for blood clotting?
Answer
Ca++
352) CuO + H2 = Cu + H2O. This equation is an example of -
Answer
Redox
353) The gas that is used in the manufacture of vanaspati ghee is -
Answer
Hydrogen
354) The anode of a dry cell is made up of -
Answer
Zine
355) The chemical used in enabalining biological materials is –
Answer
formaldehyde in water
356) What particles move around the nucleus of an atom and are negatively charged?
Answer
Electrons
357) The Fungus which is used in the alcohol industry is –
Answer
Yeast
358) Gold dissolves in –
Answer
Aqua-regia
359) Rock salt is a mineral containing –
Answer
sodium
360) In a nuclear reactor the material use for absorbing neutrons is –
Answer
cadmium
361) Solder metal is an alloy of –
Answer
lead and tin
362) Ozone depletion in the atmosphere is mainly caused by -
Answer
chlorofluorocarbon
363) All noble gases are -
Answer
Colourless and Odourless
364) Which halide is used in making sensitive emulsion on photographic film?
Answer
Silver bromide
365) Hardest allotrope of carbon is -
Answer
diamond
366) The depletion of ozone layer is due to -
Answer
chloro fluoro carbon
367) Sodium bicarbonate is commercially known as –
Answer
Baking soda
368) Coal is formed from –
Answer
compressed and hardened biomass
369) An example of semiconductor is -
Answer
Germanium
370) Non-stick kitchenwares are coated with –
Answer
Teflon
371) Which type of fire extinguisher is used for petroleum fire?
Answer
Foam type
372) ‘Freon' used as refrigerants is chemically known as -
Answer
chlorofluoro hydrocarbon
373) The material used in the manufacture of lead pencil is –
Answer
Graphite
374) If all bullets could not be removed from gunshot injury of a man, it may cause poisoning by –
Answer
Lead
375) Nail polish remover contains?
Answer
acetone
376) Water can be separated from alcohol water mixture by –
Answer
distillation
377) 'Milk Sugar' is –
Answer
Lactose
378) Which variety of coal contains recognizable traces of the original plant material?
Answer
Peat
379) Sodium calcium silicate is called .
Answer
Soft glass
380) A gas used as a disinfectant in drinking water is -
Answer
Chlorine
381) Who developed atom bomb?
Answer
J. Robert Openheimer
382) The major harmful gas emitted by automobile vehicle which causes air pollution is –
Answer
Carbon Monoxide
383) Humburger effect is otherwise known as-
Answer
Choloride shift
384) The purest form of water in nature is –
Answer
Rain water
385) The element used for making solar cells is -
Answer
Silicon
386) What is the number of atoms constituting a molecule known as -
Answer
Atomicity
387) If water smells bad, then that odour can be removed by adding -
Answer
activated carbon
388) Substance used as an anti-freeze in radiators of automobiles is :
Answer
Methyl alcohol and H2O
389) The function of sedimentation tank in sewage treatment is to:
Answer
Remove suspended solids
390) The weight of 6.023 x 1022 atoms of carbon is –
Answer
12 gms
391) Sulphur dioxide bleaches colouring matter by –
Answer
Reduction
392) KMnO4 can be used as –
Answer
Disinfectant
393) A thick paste of cement, sand and water is called –
Answer
Mortar
394) `Milk of Magnesia' is a suspension of –
Answer
magnesium hydroxide
395) Pollutant from motor car exhaust that causes mental disease is –
Answer
Lead
396) The total energy of revolving electron in an atom –
Answer
can never be positive
397) The chief source for the production of nitrogeneous fertilizers is :
Answer
Ammonia
398) Zn + 2 HCl = H2 + ZnCl, is an example of which type of reaction?
Answer
Single displacement reaction
399) Vulcanized rubber contains sulphur –
Answer
3-5%
400) The first organic compound synthesized in the laboratory was -
Answer
Urea
401) The green colour seen in firework displays is due to the chloride salt of–
Answer
Barium
402) The radiation that can penetrate deepest in our body –
Answer
Gamma-particles
403) Which radioactive pollutant has recently drawn the attention of the public due to its occurrence in the building materials?
Answer
Thorium
404) The most abundant metal in the Earth’s crust is -
Answer
aluminium
405) Adding Cl2 to benzene in the presence of AlCl3 is an example of –
Answer
Substitution reaction
406) Freon is used as -
Answer
Refrigerant
407) Nitrification is the biological process of converting –
Answer
Ammonia into nitrite
408) The most pure form of Carbon among the options is –
Answer
Anthracite
409) Chemical properties of isotopes –
Answer
must be same
410) Sour taste of lemon is due to the presence of which of the follow-ing?
Answer
Citric acid
411) Ethylene is a molecule.
Answer
nonpolar
412) If water smells bad, then that odour can be removed by adding –
Answer
activated carbon
413) The basic process taking place in nuclear reactors is -
Answer
Fission
414) Malathion is a/an -
Answer
insecticide
415) During fermentation of sugar, the compound which is always formed is –
Answer
Ethyl Alcohol
416) Warming Ammonium chloride with sodium hydrochloride in a test tube is an example of –
Answer
Open system
417) Laughing gas is –
Answer
Nitrous oxide
418) Calcium salts used as fertilizer is –
Answer
Calcium Sulphate
419) Copper substances when exposed to air gains a green coating due to the formation of:
Answer
CuCO3 Cu(OH)2
420) Bagasse, a byproduct of sugar manufacturing industry, is used for the production of -
Answer
Paper
421) Bleaching powder is made from -
Answer
Lime and Chlorine
422) An important green-house gas other than methane being produced from the agricultural fields is–
Answer
Nitrous oxide
423) The moderator used in a nuclear reactor is –
Answer
Ordinary water
424) Which is used in preparation of dynamite?
Answer
glycerol
425) Iodine can be separated from a mixture of Iodine and Potassium Chloride by –
Answer
sublimation
426) Identify the metal which is non toxic in nature.
Answer
Gold
427) Bakelite is a copolymer of Phenol and -
Answer
Formaldehyde
428) What is a mixture of potassium nitrate powdered charcoal and sulphur called?
Answer
gun powder
429) The lightest radioactive element is -
Answer
tritium
430) The chemical used in developing photographic films is –
Answer
silver bromide
431) Hard water and soft water can be distinguished by using –
Answer
detergent
432) Gamma rays are -
Answer
High energy electromagnetic
433) The name of unreactive gas is –
Answer
Nitrogen
434) Heavy water is so called because it contains -
Answer
Heavy isotope of hydrogen
435) Heating of a ore below its melting point in the absence of air is known as –
Answer
Calcination
436) The quality of petrol is expressed in terms of –
Answer
Octane number
437) The percentage of Nitrogen in Air is -
Answer
78.03
438) Energy is continuously generated in the sun due to _.
Answer
Nuclear fusion
439) The apparatus used to test acidity of aqueous solution is -
Answer
pH meter
440) Chemical formula of washing soda is -
Answer
Na2CO3.10H2O
441) The deterioration of a metal by an electrochemical process is commonly termed as –
Answer
Corrosion
442) The chief constituent of natural gas is:
Answer
Methane
443) The source of energy that causes the least global warming is –
Answer
Natural Gas
444) Formic acid is produced by –
Answer
Red ants
445) Rcmoval of carbon particles from air involves the principle of –
Answer
Electrophoresis
446) The least preferred technique in the disposal of Municipal Solid Waste is -
Answer
Bricketting
447) Which gas emitted by power stations causes acid rain?
Answer
Sulphur dioxide
448) Heavy water is –
Answer
Deuterium oxide
449) Chemical composition of heavy water is –
Answer
D2O
450) The most abundant element is -
Answer
Oxygen
451) Aluminium salt commonly used to stop bleeding is -
Answer
Aluminium sulphate
452) Hydrochloric acid is also known as -
Answer
Muriatic acid
453) The inert gas used as beacon light is -
Answer
Ne
454) Who proposed first atomic theory?
Answer
John Dalton
455) The ultrapure metal is obtained by -
Answer
zone refining
456) Antacids are found in drugs that give relief to -
Answer
Stomach ache
457) Heavy water is -
Answer
Deuterium oxide
458) Mark the compound which possesses ionic, covalent and coordinate bonds.
Answer
NH4Cl
459) Fuse wire is made of an alloy of .
Answer
Tin and Lead
460) Bleaching action of chlorine is by -
Answer
oxidation
461) The nuclear particle having no mass and no charge, but only spin is -
Answer
neutrino
462) In a period from Li to F, ionisation potential –
Answer
cannot be predicted
463) A nibble is equal to –
Answer
4
464) The non-metal found in the liquid state is –
Answer
bromine
465) Acetic acid is know as -
Answer
Vinegar
466) The chemical name of baking soda is -
Answer
Sodium bicarbonate
467) Chemical name of common salt is –
Answer
Sodium Chloride
468) Nitrogen in water is commonly found in the form of -
Answer
Nitrate
469) Chemical name of Gammaxane is -
Answer
Benzene hexachloride
470) The acid which fails to liberate carbon dioxide from sodium bicarbonate is :
Answer
Sulphuric acid
471) The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing, is -
Answer
Helium
472) A powerful eye irritant present in smog is –
Answer
peroxyacetyl nitrate
473) The most important ore of lead is –
Answer
Galena
474) The gas used to dilute oxygen for breathing by deep sea divers is-
Answer
Helium
475) The chemical substance present in bones and teeth is -
Answer
Calcium phosphate
476) Maximum permissible concentration of copper in drinking water in mg/L is -
Answer
1
477) The ‘Green House effect' is produced due to the presence of excess amount of –
Answer
Methane
478) Atoms of same element having different mass numbers are Called _.
Answer
Isotopes
479) Bee sting contains -
Answer
An acidic liquid
480) The nuclear reaction in which a heavy nucleus splits into two nuclei of nearly equal mass is called -
Answer
Nuclear fission
481) Which element found in all organic compounds?
Answer
carbon
482) J. B. Sumner isolated first enzyme from Jackbeans as-
Answer
urease
483) Highest percentage of carbon is found in which form of coal?
Answer
Anthracite
484) The chemical that is used to ripen mangoes is -
Answer
Calcium carbide
485) Bauxite is used as raw material by which industry?
Answer
Aluminium
486) An acid having basicity one is -
Answer
Disodium hydrogen phosphate
487) Dry ice is the solid form of :
Answer
Carbon dioxide
488) The common name of sodium bicarbonate is -
Answer
Baking soda
489) Which element behaves chemically both as metal and nonmetal?
Answer
Boron
490) The amount of oxygen in the atmosphere remains relatively constant because it is given off by -
Answer
Plants
491) Biogas majorly contains?
Answer
Methane
492) The scientific name for common salt is -
Answer
Sodium chloride
493) Permanent - hardness of water may be removed by addition of –
Answer
Sodium carbonate
494) One carat of diamond is equal to -
Answer
200mg
495) The manufacture of iron from iron ore involves the process of –
Answer
reduction
496) The smallest particle of an element is called -
Answer
Atom
497) There are some substances whose odor changes in acidic or basic media. These are called -
Answer
Olfactory indicators
498) If the sewage is fully oxidized, the nitrogen is in the form of –
Answer
Nitrates
499) The gas used to extinguish fire is –
Answer
Carbon monoxide
500) _is not an allotrope of carbon.
Answer
Carbon Doxide