Most Common Questions on Chemistry for SSC and Railways Exams

1. Carbogen is used in
a) CO2 poisoning
b) CO poisoning
c) phosgene poisoning
d) anesthesia

2. Soda-water contains
a) sodium bicarbonate
b) sodium carbonate
c) carbonic acid
d) sodium hydroxide


3. The purest form of carbon is
a) animal charcoal
b) coal
c) wood charcoal
d) sugar charcoal 

4. Diamonds are weighed in
a) grams
b) pounds
c) carats
d) tons

5. The poisonous nature of carbon monoxide is due to
a) cutting off supply of oxygen
b) its being converted into carbon dioxide
c) its combination with hemoglobin of blood
d) its blocking of vocal chords

6. A compound of carbon used as anaesthetic is
a) carbon disulphide
b) carbon tetrachloride
c) phosgene
d) Chloroform(CHCl₃) 

7. Which of the following carbon compounds is used as a fire-extinguisher?
a) Carbon disulphide
b) Carbon Tetrachloride(CCl₄)
c) chloroform
d) Methylene chloride


8. Rayon is made from
a) cotton
b) wool
c) cellulose
d) silk

9. Which of the following is a very good supporter of combustion?
a) Carbon monoxide
b) Oxygen
c) Nitrogen
d) Hydrogen


10. Which of the following can absorb gases quickly?
a) Activated charcoal
b) Anthracite coal
c) Diamond
d) Graphite

11. Marble is
a) calcium carbonate
b) sodium carbonate
c) magnesium sulphate
d) ferric chloride

12. The form of carbon used in decolorising sugar solution is
a) wood charcoal
b) animal charcoal
c) coconut charcoal
d) lamp black

13. Artificial diamonds were produced by
a) Moissan
b) Davy
c) Faraday
d) Marie Curie

14. Marsh gas is
a) ethane
b) ethylene
c) acetylene
d) Methane 

15. The oldest known organic compound is
a) urea
b) methane
c) benzene
d) acetic acid

16. Vinegar is the trade name for
a) chloroform
b) acetic acid
c) phenol
d) carbon tetrachloride

17. The scientist who synthesized the first organic compound (urea) in the laboratory was
a) Wohler
b) Dalton
c) Lavoisier
d) Fischer

18. Methylated spirit is a mixture of
a) methyl alcohol and acetic acid
b) methyl alcohol and ethyl alcohol
c) ethyl alcohol and pyridine
d) methyl alcohol and pyridine

19. The simplest hydrocarbon is
a) benzene
b) methane
c) ethane
d) butane

20. During fermentation, the by-product is
a) ethyl alcohol
b) methyl alcohol
c) carbon monoxide
d) carbon dioxide 

21. Hydrogen bomb is based on the principle of
a) Natural radioactivity
b) Nuclear fission
c) Nuclear fusion
d) Artificial radioactivity

22. The father of modern chemistry is
a) Lavoisier
b) Dalton
c) Mendeleeff
d) Priestley

23. Which one of the following substances does not have a melting point
a) Sodium chloride
b) Mercury
c) Bromine
d) Glass

24. Which one of the following elements is the poorest conductor of heat?
a) Zinc
b) Lead
c) Mercury
d) Sodium

25. Which one among the following agents is added to domestic LPG(Liquefied Petroleum Gas) cylinder to help in the detection of gas leakage
a) Chloroform
b) Ethanethiol
c) Methane
d) Ethanol

26. The photoelectric effect is described as the ejection of electrons from the surface of a metal when

a) Electron of suitable velocity impinge on it
b) Light of suitable wavelength falls on it
c) It is heated
d) It is placed in strong electric field


27. Milk is a
a) Element
b) Metal
c) Mixture
d) None of these

28. Atomic number is equal to [Reference 1#]
a) Number of electrons
b) Number of nutron
c) Number of protons
d) Total number of protons and neutrons

29. Which of the following is produced during the formation of photochemical smog
a) Nitrogen Oxides
b) Hydrocarbons
c) Methane
d) Ozone


30. The oxide of Nitrogen used in medicine as anesthetic is
a) Nitrogen pentoxide(N₂O₅)
b) Nitrous oxide
c) Nitric oxide

d) Nitrogen dioxide

31. Which of the following is a halogen?
a) Radon
b) Astatine
c) Cesium
d) Ruthenium


32. The compound used in photography is
a) Ammonium dichromate
b) Copper sulphate
c) Magnesium sulphate
d) Sodium thiosulphate

33. Brine is a solution of
a) Sodium chloride in water
b) Iodine in alcohol
c) Sulphur in carbon disulphide
d) Potassium iodide in water

34. Lunar caustic is
a) Calcium sulphate
b) Ammonium chloride
c) Caustic soda
d) Silver nitrate

35. The formula for cane sugar is
a) C6H12O6
b) C2H5OH
c) C12H22O11
d) C7H8O7

36. Temporary hardness is due to the presence of
a) Calcium carbonate
b) Calcium bicarbonate
c) Magnesium sulphate
d) Calcium sulphate

37. The compounds produced by plants in the process of photosynthesis are
a) Carbohydrates
b) Proteins
c) Salts
d) Fats

38. The metal which reacts most violently with cold water is
a) Calcium
b) Sodium
c) Magnesium
d) Potassium

39. ‘Boiler scales’ contain
a) Calcium carbonate
b) Magnesium bicarbonate
c) Calcium sulphate
d) Magnesium sulphate

40. The first organic compound prepared in the laboratory was
a) Acetic acid
b) Chloroform
c) Urea
d) Methane

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1500+ Chemistry MCQ's