General Science (Chemistry) Practice Sets for WBCS, SSC, Rail, UPSC Exam P8

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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.

76. Which of the following substances can act as an only reducing agent?

(A) K₂Cr₂O₇

(B) H₂S

(C) H₂O₂

(D) MnO₂

Correct Answer: [B] H₂S.

77. Hydrogen peroxide has the same number of electrons as (Iso-electronic Species)

(A) CH₂ = CH₂

(B) CH₃CHO

(C) HCHO

(D) CH₃OH

Correct Answer: [D] CH₃OH

78. Vulcanization is the process of heating rubber with 3-5 % of
(A) Potassium permanganate
(B) Naphthalene
(C) Sulphur
(D) Lime

Correct Answer: [C] Sulphur.

79. Paint & Varnish contains
(A) Mustard oil
(B) Kerosene oil
(C) Linseed oil
(D) Coconut oil

Correct Answer: [C] Linseed oil.

80. Which pollutant of the atmosphere inhibits the Hill reaction of photosynthesis?
(A) Ultraviolet rays
(B) Hydro Carbon
(C) Peroxyacetyl nitrate
(D) Nitrogen monoxide

Correct Answer: [C] Peroxyacyl nitrate.

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