Each of the following substances dissolves exothermically in water except :

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${CuSO}_{4} (s)$

$NaOH (s)$

${NH}_{4} {NO}_{3} (s)$

$H_{2} {SO}_{4} (l)$

answer is B.

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Detailed Solution

The beaker turns cold when ammonium nitrate is dissolved in water because it is an endothermic process, which means it takes in heat from the environment. As a result, the process of hydrating ammonium nitrate is endothermic, which causes the beaker to become chilly.

Ammonium nitrate $({NH}_{4} {NO}_{3} (s))$ dissolves exothermically in water.

Hence, option B is correct.

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