Friday, April 26, 2019

WBCS Polity and Constitution MCQs Prelims and Mains

Chemistry Practice Sets for WBCS, SSC, Rail, UPSC Exam P8


Page 8

168371. Muriatic acid used in household work is a diluted form of
A
Oxalic acid
B
Aqua regia
C
Acetic acid
D
Hydrochloric acid
D
Correct Answer: D. Hydrochloric acid
168472. In underground Railways, the air is purified by using
A
Oxygen
B
Hydrogen peroxide
C
Ozone
D
None of the above
B
Correct Answer: B. Hydrogen peroxide
168573. Ozone depletion in the stratosphere is mainly caused by
A
Chlorofluorocarbon
B
Nitric Oxide
C
Sulphur-di-Oxide
D
Carbon dioxide
A
Correct Answer: A. Chlorofluorocarbon
168674. Which one of the following is not a metal?
A
Nickel
B
Silicon
C
Platinum
D
Mercury
B
Correct Answer: B. Silicon
168775. 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
C
Correct Answer: C. Remains unchanged
168876. Which of the following substances can act as an only reducing agent?
A
K2Cr2O7
B
H2S
C
H2O2
D
MnO2
B
Correct Answer: B. H2S
168977. Hydrogen peroxide has the same number of electrons as (Iso-electronic Species)
A
CH2 = CH2
B
CH3CHO
C
HCHO
D
CH3OH
D
Correct Answer: D. CH3OH
169078. Vulcanization is the process of heating rubber with 3-5 % of
A
Potassium permanganate
B
Naphthalene
C
Sulphur
D
Lime
C
Correct Answer: C. Sulphur
169179. Paint and Varnish contains
A
Mustard oil
B
Kerosene oil
C
Linseed oil
D
Coconut oil
C
Correct Answer: C. Linseed oil
169280. Which pollutant of the atmosphere inhibits the Hill reaction of photosynthesis?
A
Ultraviolet rays
B
Hydro Carbon
C
Peroxyacetyl nitrate
D
Nitrogen monoxide
C
Correct Answer: C. Peroxyacetyl nitrate



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