The pollutants which come directly in the air from sources are called primary pollutants. Primary pollutants are sometimes converted into secondary pollutants. Which of the following belongs to secondary air pollutants?
(i) CO
(ii) Hydrocarbon
(iii) Peroxyacetyl nitrate
(iv) NO

Answers (1)

The answer is the option (iii) Peroxyacetyl nitrate

Explanation:

Ozone is produced when oxygen atoms combine with O_{2} in the air

O(g) + O_{2}(g) \rightarrow O_{3}(g)               ………. (ii)

Now, this O3 reacts with NO to regenerate NO2, viz., a brown gas and contributes to haze at high levels.

NO(g) + O_{3}(g) \rightarrow NO_{2}(g) + O_{2}(g)        ………….. (iii)

Ozone is toxic. Chemicals such as formaldehyde, Acrolein and PAN are produced due to the reaction of NO­_{2} and O_{3} with unburnt hydrocarbons in the polluted air.

(Note: NO­_{2} and O_{3} are strong oxidising agents).

3CH_{4} + 2O_{3} \rightarrow 3CH_{2}=O + 3H_{2}O

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