Of the reactions involved in the photodecomposition of ozone (shown below) , which are photochemical?
1) O₂(g) + hv →O (g) + O (g)
2) O (g) + O₂(g) + M (g) → O₃(g) + M^*(g)
3) O₃(g) + hv →O₂(g) + O (g)
4) O (g) + O (g) + M (g) →O₂(g) + M^*(g)

Question

Quizplus · Accepted Answer

Photochemical reactions involve light as a reactant. Reactions 1 and 3 involve light (hv) as a reactant, making them photochemical. Reactions 2 and 4 do not involve light as a reactant and are not photochemical. Therefore, the best choice is C, which includes the only reactions that are photochemical (1 and 3).

Of the Reactions Involved in the Photodecomposition of Ozone (Shown