NO₂ is involved in the formation of smog and acid rain. It is formed importantly as:
NO(g) + O₃(g) ⇌ NO₂(g) + O₂(g); K_c = 6.0 × 10³⁴
The air over a metropolitan city contained 1.0 × 10⁻⁵ M-NO,

Question

NO₂ is involved in the formation of smog and acid rain. It is formed importantly as:
NO(g) + O₃(g) ⇌ NO₂(g) + O₂(g); K_c = 6.0 × 10³⁴
The air over a metropolitan city contained 1.0 × 10⁻⁵ M-NO, 1.0 × 10⁻⁶ M-O₃, 2.5 × 10⁻⁴ M-NO₂ and 8.2 × 10⁻³ M-O₂. These data suggest that

Prashant Kotian · Accepted Answer

Correct answer: B. The reaction quotient Q = ([NO₂][O₂]) / ([NO][O₃]) = (2.5 × 10⁻⁴ × 8.2 × 10⁻³) / (1.0 × 10⁻⁵ × 1.0 × 10⁻⁶) = 2.05 × 10⁻⁶ / 10⁻¹¹ = 2.05 × 10⁵. Since Q < K_c (2.05 × 10⁵ < 6.0 × 10³⁴), the reaction will proceed in the forward direction, forming more NO₂ and O₂. Therefore, correct answer is B.

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