1

NEET 2021

MCQ (Single Correct Answer)
Match List-I with List-II :

List-I List-II
(a) $$2S{O_2}(g) + {O_2}(g) \to 2S{O_3}(g)$$ (i) Acid rain
(b) $$HOCl(g)\buildrel {hv} \over
\longrightarrow \mathop O\limits^ \bullet H + \mathop C\limits^ \bullet l$$
(ii) Smog
(c) $$CaC{O_3} + {H_2}S{O_4} \to CaS{O_4} + {H_2}O + C{O_2}$$ (iii) Ozone depletion
(d) $$N{O_2}(g)\buildrel {hv} \over
\longrightarrow NO(g) + O(g)$$
(iv) Tropospheric pollution


Choose the correct answer from the options given below.
A
(a)-(iii), (b)-(ii), (c)-(iv), (d)-(i)
B
(a)-(i), (b)-(ii), (c)-(iii), (d)-(iv)
C
(a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)
D
(a)-(iv), (b)-(iii), (c)-(i), (d)-(ii)

Explanation

$$\bullet$$ Tropospheric pollution : In the presence of pollutant, SO2 converts into SO3.

$$2S{O_2} + {O_2} \to 2S{O_3}$$

$$\bullet$$ In spring season, sunlight breaks HOCl and Cl2 to give chlorine radicals.

$$HOCl\buildrel {hv} \over \longrightarrow \mathop O\limits^ \bullet H(g) + \mathop C\limits^ \bullet l(g)$$

These chlorine radicals deplete ozone layer

$$\bullet$$ High level of sulphur causes acid rain which reacts with marble and causes discolouring and disfiguring

$$CaC{O_3} + {H_2}S{O_4} \to CaS{O_4} + {H_2}O + C{O_2}$$

$$\bullet$$ A chain reaction occurs from interaction of NO with sunlight in which NO is converted to NO2 which absorb energy from sunlight and breaks into NO and O, which causes photochemical smog.

$$N{O_2}(g)\buildrel {hv} \over \longrightarrow NO(g) + O(g)$$
2

NEET 2019

MCQ (Single Correct Answer)
Among the following, the one that is not a green house gas is :
A
ozone
B
sulphur dioxide
C
nitrous oxide
D
methane

Explanation

Sulphurdioxide (SO2) is not a green house gas.
3

NEET 2018

MCQ (Single Correct Answer)
Which oxide of nitrogen is not a common pollutant introduced into the atmosphere both due to natural and human activity?
A
N2O5
B
NO2
C
N2O
D
NO

Explanation

N2O5 is highest oxidation number oxide which will not easily formed by common or natural oxidation of lower oxides of nitrogen.
4

AIPMT 2014

MCQ (Single Correct Answer)
Which one of the following is not a common component of Photochemical smog?
A
Ozone
B
Acrolein
C
Peroxyacetyl nitrate
D
Chlorofluorocarbons

Explanation

CFC (Chlorofluoro carbons) is not the component of photochemical smog.

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