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Formation of photochemical smog involves the following reaction in which A, B and C are respectively. (i) NO2 —hv→ A + B (ii) B + O2 → C (iii) A + C → NO2 + O2 Choose the correct answer from the options given below :

1. O, N2O and NO
2. NO, O and O3
3. N, O2 and O3
4. O, NO and NO3

Correct answer: NO, O and O3

Solution

The correct option is right because the reaction sequence describes the photolysis of nitrogen dioxide (NO2) under sunlight, producing nitric oxide (NO) and oxygen (O), which then reacts to form ozone (O3) in the presence of additional oxygen.

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