GK Questions: General Science(Chemistry) – Set 19

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1. ………………… is the constituent of tear gas
   1.Ether
   2.Chloropicrin
   3.Ethanol
   4.Ethane
   5.None of these
   
   Answer & Explanation

   Answer – 2.Chloropicrin
   Explanation :
   Chloropicrin, a component of tear gas, is used as a warning agent.
   
   
   
2. Which Vitamin requires Cobalt for its activity ?
   1.Vitamin B₁₂
   2.Vitamin B₄
   3.Vitamin A
   4.Vitamin B₁₀
   5.None of these
   
   Answer & Explanation

   Answer – 1.Vitamin B₁₂
   Explanation :
   Although Cobalt has little direct activity of its own in the body, it is anintegral component of Vitamin B12
   
   
   
3. Which of the following is is the densest naturally occurring element ?
   1.Platinum
   2.Aluminium
   3.Osmium
   4.Uranium
   5.None of these
   
   Answer & Explanation

   Answer – 3.Osmium
   Explanation :
   Osmium is the densest naturally occurring element, with a density of 22.59 g/cm³
   
   
   
4. To avoid melting of ice ………………. is used
   1.Butane
   2.Metahne
   3.Acitic acid
   4.Gelatine
   5.None of these
   
   Answer & Explanation

   Answer – 4.Gelatine
   Explanation :
   Gelatin is used to achieve a smooth gel texture and prevent exudation on freezing
   
   
   
5. The temperature of oxy-acetylene flame is ………………..
   1.2800^oC
   2.3200^oC
   3.4000^oC
   4.1800^oC
   5.None of these
   
   Answer & Explanation

   Answer – 2.3200^oC
   Explanation :
   Oxygen-acetylene combination produces the highest temperature of around 3200^oC
   
   
   
6. ……………………… is used to check water pollution caused by industrial affluents
   1.Water Hyacinth
   2.Parthenium
   3.Elephant Grass
   4.All of these
   5.None of these
   
   Answer & Explanation

   Answer – 1.Water Hyacinth
   Explanation :
   Water Hyacinth is used to check water pollution caused by industrial affluents
   
   
   
7. Acetic acid on decarboxylation gives which of the following ?
   1.Ethane
   2.Propane
   3.Butane
   4.Methane
   5.None of these
   
   Answer & Explanation

   Answer – 4.Methane
   Explanation :
   Acetic acid on decarboxylation gives Methane
   
   
   
8. ……………… is obtained as slag in a blast furnance ?
   1.Calcium Sulphate
   2.Calcium Oxide
   3.Calcium Silicate
   4.Calcium Chloride
   5.None of these
   
   Answer & Explanation

   Answer – 3.Calcium Silicate
   Explanation :
   Calcium silicate hydrate (CSH) solids were prepared from hydrated lime and iron blast furnace slag in an aqueous agitated slurry at 92 degrees
   
   
   
9. Drying oils contains large proportion of
   1.Cholestrol
   2.Unsaturated fatty acids
   3.Fats
   4.Protien
   5.None of these
   
   Answer & Explanation

   Answer – 2.Unsaturated fatty acids
   Explanation :
   Drying oils contain a large proportion of unsaturated acids like linoleic and linolenic acids. These oils are valuable in paint industry Fatty acids containing double bonds are termed unsaturated
   
   
   
10. ……………………. are used as fuel in propellant of rockets
    1.Liquid Hydrogen+Liquid Nitrogen
    2.Liquid Argonn+Liquid Oxygen
    3.Liquid Nitrogen+Liquid Oxygen
    4.Liquid Hydrogen+Liquid Oxygen
    5.None of these
    
    Answer & Explanation

    Answer – 4. Liquid Hydrogen+Liquid Oxygen
    Explanation :
    LOX and liquid hydrogen, used in the Space Shuttle orbiter