Let us consider an endothermic reaction which is non-spontaneous at...

Let us consider an endothermic reaction which is non-spontaneous at the freezing point of water. However, the reaction is spontaneous at boiling point of water. Choose the correct option.

Options

ABoth $\Delta \mathrm{H}$ and $\Delta \mathrm{S}$ are (-ve)
B $\Delta \mathrm{H}$ is (-ve) but $\Delta \mathrm{S}$ is (+ve)
C $\Delta \mathrm{H}$ is $(+\mathrm{ve})$ but $\Delta \mathrm{S}$ is $(-\mathrm{ve})$
DBoth $\Delta \mathrm{H}$ and $\Delta \mathrm{S}$ are (+ve)

Correct answer

D. Both $\Delta \mathrm{H}$ and $\Delta \mathrm{S}$ are (+ve)

Step-by-step solution

On increasing temperature, the given endothermic reaction becomes spontaneous.

\Delta G=\Delta H-T \Delta S

For spontaneity,

\Delta \mathrm{G} < 0

Given,

\Delta \mathrm{H}>0

So,

\Delta \mathrm{S}

should be +ve.

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