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Question

Dissolution of ammonium chloride in water is an endothermic reaction, yet it is a spontaneous process. This is due to the fact that :

A
ΔH is +ve, ΔS is -ve.
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B
ΔH is -ve, ΔS is +ve.
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C
ΔH is +ve, ΔS is +ve and ΔH < TΔS
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D
ΔH is +ve and ΔH > TΔS
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Solution

The correct option is D ΔH is +ve, ΔS is +ve and ΔH < TΔS
ΔH>0 (endothermic reaction)
Now, ΔG=ΔHTΔS
For spontaneous process, ΔG<0
Therefore, ΔG=ΔHTΔS<0
But ΔH>0
Therefore for ΔG to be negative, ΔS>0 and ΔH<TΔS.

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