Friday, February 28, 2020

WBCS Polity and Constitution MCQs Prelims and Mains

Chemistry questions and answers For UPSC | SSC | Rail | RRB | State PSC P15

Chemistry - 15

71. Muriatic acid used in household work is a diluted form of
(A) Oxalic acid
(B) Aqua regia
(C) Acetic acid
(D) Hydrochloric acid

Correct Answer: [D] Hydrochloric acid.
72. In underground Railways, the air is purified by using
(A) Oxygen
(B) None of the above
(C) Ozone
(D) Hydrogen peroxide

Correct Answer: [D] Hydrogen peroxide.
73. Ozone depletion in the stratosphere is mainly caused by
(A) Chlorofluorocarbon
(B) Nitric Oxide
(C) Sulphur-di-Oxide
(D) Carbon dioxide

Correct Answer: [A] Chlorofluorocarbon.
74. Which one of the following is not a metal?
(A) Nickel
(B) Silicon
(C) Platinum
(D) Mercury

Correct Answer: [B] Silicon.
75. The volume of a vessel containing an ideal gas is doubled and its temperature (in °K) is also doubled. The pressure of the gas
(A) In one-fourth of the original pressure.
(B) Is four times the original pressure.
(C) Remains unchanged.
(D) Is doubled

Correct Answer: [C] Remains unchanged..


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