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Physics-(general)

NEET Physics (general) MCQ Question

Type: MCQ-numerical-Easy-Class 11

Given the reaction: 12N2(g)+O2(g)→NO2(g)\frac{1}{2} \text{N}_2 (g) + \text{O}_2 (g) \rightarrow \text{NO}_2 (g) with ΔrH∘=+33.2kJ mol−1\Delta_r H^\circ = +33.2 \text{kJ mol}^{-1}, what can be inferred about the reaction's spontaneity at constant external pressure?

A

The reaction is non-spontaneous as it absorbs heat.

B

The reaction is spontaneous because ΔrH∘\Delta_r H^\circ is positive.

C

The reaction is spontaneous at all temperatures.

D

The reaction is non-spontaneous because ΔrH∘\Delta_r H^\circ is negative.

Correct Answer

Option A

Detailed Explanation

In the given reaction, ΔrH∘\Delta_r H^\circ is positive, indicating it is endothermic and absorbs heat, which generally suggests non-spontaneity unless other factors like entropy change favor the reaction.

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