71. Muriatic acid used in household work is a diluted form of
(A) Oxalic acid
(B) Aqua regia
(C) Acetic acid
(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.
73. Ozone depletion in the stratosphere is mainly caused by
(A) Chlorofluorocarbon
(B) Nitric Oxide
(C) Sulphur-di-Oxide
(D) Carbon dioxide.
74. Which one of the following is not a metal?
(A) Nickel
(B) Silicon
(C) Platinum
(D) Mercury.
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.
76. Which of the following substances can act as an only reducing agent?
77. Hydrogen peroxide has the same number of electrons as (Iso-electronic Species)
78. Vulcanization is the process of heating rubber with 3-5 % of
(A) Potassium permanganate
(B) Naphthalene
(C) Sulphur
(D) Lime
79. Paint & Varnish contains
(A) Mustard oil
(B) Kerosene oil
(C) Linseed oil
(D) Coconut 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.
(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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