Assertion (A) :Photochemical smog is oxidising in nature. 

Reason (R) : Photochemical smog contains NO₂ and O₃ , 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. 

<p>This is a Assertion Type Questions as classified in NCERT Exemplar</p><p>Option (i)</p><p>i.e., Both A and R are correct, and R is the correct explanation of A is the answer since a photochemical smog has high concentration of oxidizing agents and is known as oxidizing smog. Two of the pollutants that are emitted are hydrocarbons (unburned fuels) and nitric oxide (NO). When these pollutants build up to sufficiently high levels, a chain reaction occurs from their interaction with sunlight in which NO is converted into nitrogen dioxide and this in turn absorbs energy from the sunlight and breaks up into nitric oxide and free oxygen atoms. This is shown as-</p><p>NO₂ (g) &nbsp;NO (g) + O (g)</p><p>O (g) + O₂ (g)? O₃ (g)</p>

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