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  4. Dissolution of ammonium chloride in water leads to a cooling sensation. At constant temperature, this process is accompanied by

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Q. Dissolution of ammonium chloride in water leads to a cooling sensation. At constant temperature, this process is accompanied by

BHUBHU 2009

Solution:

Since, cooling is produced, the reaction is endothermic, ie, $\Delta H=+ ve$.
$\Delta G=\Delta H-T \Delta S$
[For spontaneous process $\Delta G=- ve ]$
As the value of $\Delta H$ is positive, the value of $\Delta S$ must be positive to get a negative value of $\Delta G$. Thus, the process is accompanied by increase in entropy.