Environmental Chemistry CDS Questions

CDS Chemistry

Environmental Chemistry MCQ Questions


1.
Air pollution mainly accumulates and affects living organisms in which lowermost layer of the Earth's atmosphere?
A.
Stratosphere
B.
Mesosphere
C.
Thermosphere
D.
Troposphere
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ANSWER :
D. Troposphere
2.

Which toxic gas, produced mainly from the incomplete combustion of fuel in vehicles, is dangerous because it binds strongly with haemoglobin in blood?

A.

Sulphur dioxide (SO2)

B.

Carbon dioxide (CO2)

C.

Carbon monoxide (CO)

D.

Nitrogen dioxide (NO2)

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ANSWER :

C. Carbon monoxide (CO)

3.

Which gaseous pollutant, released mainly from burning sulphur-containing coal and oil, is a major contributor to acid rain?

A.

Methane

B.

Carbon monoxide

C.

Sulphur dioxide (SO2)

D.

Ground-level ozone

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ANSWER :

C. Sulphur dioxide (SO2)

4.
Oxides of nitrogen (NOx), formed during high-temperature combustion in vehicle engines, mainly contribute to the formation of:
A.
Increased soil fertility
B.
Ozone layer thickening
C.
Hard water deposits
D.
Photochemical smog and acid rain
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ANSWER :
D. Photochemical smog and acid rain
5.
The brownish haze formed over cities with heavy traffic, caused by the reaction of sunlight with nitrogen oxides and unburnt hydrocarbons, is known as:
A.
Classical (London) smog
B.
Acid fog
C.
Volcanic haze
D.
Photochemical smog
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ANSWER :
D. Photochemical smog
6.
Classical smog, historically associated with cold and humid climates such as in London, is formed by a combination of smoke, fog, and which gas?
A.
Carbon monoxide
B.
Sulphur dioxide
C.
Nitrogen dioxide
D.
Ground-level ozone
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ANSWER :
B. Sulphur dioxide