Match List-I (emitted pollutant) with List-II (environmental impact):

List I

i.Carbon dioxide

ii.Carbon monoxide

iii.Nitrogen oxide

iv.Benzene and hydrocarbons

List II

a.Formation of acid rain

b.Toxic and carcinogenic

c.Toxic and can cause respiratory diseases

d.Contribution to global warming as a greenhouse gas

Ai-d, ii-c, iii-a, iv-b ✓ Correct

Bi-d, ii-b, iii-a, iv-c

Ci-d, ii-b, iii-c, iv-a

Di-a, ii-b, iii-c, iv-d

Correct answer: (A) i-d, ii-c, iii-a, iv-b

Explanation

Carbon dioxide contributes to global warming as a greenhouse gas.

Carbon monoxide is toxic and can cause respiratory problems by cutting oxygen delivery.

Nitrogen oxide contributes to the formation of acid rain.

Benzene and hydrocarbons are toxic and carcinogenic.

The correct pairing links carbon dioxide to warming, carbon monoxide to respiratory harm, nitrogen oxide to acid rain and benzene to cancer risk.

Carbon monoxide binds haemoglobin far more strongly than oxygen, causing suffocation.

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