JEE Main · 2023 · 25 Jan 2023 · Shift 1 · Environmental Chemistry

Some reactions of

NO_{2}

relevant to photochemical smog formation are

Identify

A, B, X

and Y

(A) $X = [O], Y = NO, A = O_{2}, B = O_{3}$ ✓ Correct
(B) $X = N_{2} O, Y = [O], A = O_{3}, B = NO$
(C) $X = \frac{1}{2} O_{2}, Y = NO_{2}, A = O_{3}, B = O_{2}$
(D) $X = NO, Y = [O], A = O_{2}, B = N_{2} O_{3}$

Answer: (A)

Solution

Nitrogen dioxide is the chief light absorber in photochemical smog, and the absorbed sunlight splits it into nitric oxide and a reactive oxygen atom, so the two fragments are atomic oxygen and nitric oxide. The oxygen atom then combines with molecular oxygen of the air to build up ozone. Thus the photolysis gives atomic oxygen together with nitric oxide, and the oxygen atom reacting with molecular oxygen produces ozone.

JEE Main · 2023 · 25 Jan 2023 · Shift 1 · Single correct option

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JEE Main · 2023 · 25 Jan 2023 · Shift 1 · Environmental Chemistry

Solution

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