Which of the reaction is expected to be spontaneous at low temperatures and non-spontaneous at high temperatures:

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Which of the reaction is expected to be spontaneous at low temperatures and non-spontaneous at high temperatures:

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Vaporisation of any volatile liquid

Dissociation of ${PCl}_{5}$ to give ${PCl}_{3}$ and Cl

Formation of $H_{2} O$ from $H_{2}$ (g) and $O_{2}$ (g)

Melting of ice

answer is B.

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Detailed Solution

Formation of $H_{2} O$ from $H_{2}$ (g) and $O_{2}$ (g) is spontaneous at low temperature and non- spontaneous at high temperature.

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