In a flask, colourless is in equilibrium with brown coloured . At equilibrium, when the flask is heated at 373 K, the brown colour deepens and on cooling it becomes less coloured. The change in enthal

Question

In a flask, colourless $	ext{N}_2	ext{O}_4$ is in equilibrium with brown coloured $	ext{NO}_2$. At equilibrium, when the flask is heated at 373 K, the brown colour deepens and on cooling it becomes less coloured. The change in enthalpy for this reaction is

Prashant Kotian · Accepted Answer

Correct answer: B. Heating favors the formation of (the brown colour deepens), indicating that the forward reaction absorbs heat. Therefore, the reaction is endothermic and its change in enthalpy is positive.

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