Assertion (A) : Photochemical smog is oxidising in nature.
Reason (R) : Photochemical smog contains NO_{2} and O_{3}, which are formed during the sequence of reactions.
(i) Both A and R are correct and R is the correct explanation of A.
(ii) Both A and R are correct but R is not the correct explanation of A.
(iii) Both A and R are not correct.
(iv) A is not correct but R is correct.

Answers (1)

The answer is the option (i) Both A and R are correct, and R is the correct explanation of A.

Explanation: Photochemical smog is also called oxidising smog since it has high concentrations of oxidising agents. When No and hydrocarbons are built up in sufficiently high levels, a chain reaction occurs from their interaction with sunlight where NO is converted to NO_{2}. This NO_{2}  absorbs sunlight and breaks into NO and a free oxygen atom.

NO_{2}(g)\overset{h\nu }{\rightarrow}NO(g)+O(g)

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

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