SSC Chemistry Previous year questions Set 5

41. Which one of the following metals pollutes the air of a city having large number of automobiles?[SSC CGL Prelim 2000]
A. Cadmium
B. Chromium
C. Lead
D. Copper

Answer –C. Lead

42. Which of the following is chiefly present in LPG (Liquefied Petroleum Gas) ? [SSC CPO Sub-Inspector 2003]
A. Methane
B. Ethane
C. Propane
D. Butane

Answer –D. Butane

43. What is the most commonly used substance in fluorescent tubes?[SSC CGL Prelim 2003]
A. Sodium oxide and argon
B. Sodium vapour and neon
C. Mercury vapour and argon
D. Mercury oxide and neon

Answer –C. Mercury vapour and argon

44. The major harmful gas emitted by automobile vehicle which causes air pollution is – [SSC CPO Sub-Inspector 2003]
A. Carbon Monoxide
B. Methane
C. Carbon dioxide
D. Ozone gas

Answer –C. Carbon dioxide

45. Galvanization is the : [SSC CGL Prelim 2002]
A. deposition of zinc on iron
B. deposition of tin on iron
C. deposition of copper on iron
D. deposition of aluminium on iron

Answer –A. deposition of zinc on iron

46. The acid used in lead storage cells is – [SSC CPO Sub-Inspector 2003]
A. phosphoric acid
B. hydrochloric acid
C. nitric acid
D. sulphuric acid

Answer –D. sulphuric acid

47. Galvanised iron is made by coating iron with [SSC CPO Sub-Inspector 2004]
A. Zinc
B. Nickel
C. Chromium
D. Sulphur

Answer –A. Zinc

48. Which of the following is not a precious/semi-precious stone?[SSC Section Officer (Commercial Audit) 2003]
A. Sapphire
B. Ruby
C. Pearl
D. Emerald

Answer –C. Pearl

49. The enzyme that converts glucose to ethyl alcohol is : [SSC CGL Prelim 2002]
A. Invertase
B. Maltase
C. Zymase
D. Diastase

Answer –C. Zymase

50. Bauxite is an alloy of which of the following metals ? [SSC Section Officer (Audit) 2003]
A. Aluminium
B. Silver
C. Tin
D. Iron

Answer –A. Aluminium

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