GK INFOPEDIA

[1] Which is used in preparation of dynamite? A. glycerol B. ethyl alcohol C. methyl alcohol D. glycol Ans: glycerol Explanation : Dynamite is an explosive made of nitroglycerin, sorbents (such as powdered shells or clay) and stabilizers. It was invented by the Swedish chemist and engineer Alfred Nobel in Geesthacht, and patented in 1867. […]

[1] Carbon dioxide is – A. a reducing agent B. an oxidising agent C. a dehydrating agent D. a bleaching agent Ans: a reducing agent Explanation : A good reducing agent must be able to donate electrons readily. This means that it must not have very much attraction for electrons. Carbon dioxide is just like […]

[1] Which among the following coal contains 90 per cent of carbon? A. Anthracite B. Bitumen C. Lignite D. Peat Ans: Anthracite Explanation : Coal is a combustible black or brownish-black sedimentary rock usually occurring in rock strata in layers or veins called coal beds or coal seams. The harder forms, such as anthracite coal, […]

[1] The most abundant metal in the Earth’s crust is – A. zinc B. copper C. aluminium D. iron Ans: aluminium Explanation : The most abundant metal on Earth is aluminum. Aluminum is the third most abundant element in the Earth’s crust, and makes up 8 percent of it by parts per million. The most […]

[1] Activated Charcoal is used to remove colouring matter from pure substances by – A. Bleaching B. Oxidation C. Adsorption D. Reduction Ans: Adsorption Explanation : Heating wood to a very high temperature in the absence of air makes charcoal. When it is heated to an even higher temperature, about 930°C, impurities are driven from […]

[1] The inert gas abundantly found in widely distributed is – A. Xe B. Kr C. He D. Ar Ans: Ar Explanation : Argon (Ar) is the most prevalent of the noble gases in Earth’s crust with the element composing 0.00015% of this crust. [2] Brine refers to : A. Salt water B. Sweet water […]

[1] Two elements which can form a large number of compounds are A. Carbon and Hydrogen B. Carbon and Nitrogen C. Carbon and Oxygen D. Carbon and Sulphur Ans: Carbon and Hydrogen Explanation : The carbon-hydrogen bond (C-H bond) is a bond between carbon and hydrogen atoms that can be found in many organic compounds. […]

[1] What is the chemical name for `Baking Soda’? A. Sodium carbonate B. Sodium bicarbonate C. Sodium nitrite D. Sodium nitrate Ans: Sodium bicarbonate Explanation : Sodium bicarbonate or sodium hydrogen carbonate is the chemical compound with the formula NaHCO3. Sodium bicarbonate is a white solid that is crystalline but often appears as a fine […]

[1] The purest form of water in nature is – A. Rain water B. Lake water C. River water D. Sea water Ans: Rain water Explanation : Rainwater is often considered the purest form of water available on the Earth. The evaporation of water by the sun allows the salts and other impurities to be […]

[1] The wine is prepared by the process of – A. fermentation B. catalysation C. conjugation D. displacement Ans: fermentation Explanation : Like lactic acid fermentation, alcoholic fermentation generates NAD+ so that glycolysis can continue to produce ATP. However, alcoholic fermentation in yeast produces ethyl alcohol instead of lactic acid as a waste product. [2] […]