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Q.

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

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a

Both ΔH and ΔS are (+ve)

b

ΔH is (–ve) but ΔS is (+ve)

c

ΔH is (+ve) but ΔS is (–ve)

d

Both ΔH and ΔS are (–ve)

answer is A.

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Detailed Solution

Reaction is spontaneous at relatively high temperature and non-spontaneous at low temperature ΔG = ΔH – TΔS
It is only possible when ΔH and ΔS both are positive.

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