Question

explain:

when ammonium nitrate is dissolved in water contained in a beaker,it becomes cold?

when little sulphuric acid is added to water in a beaker,it becomes hot?

Answer 1

Dissolution of some of the substances is exothermic in nature while for others it is endothermic.

Dissolution of ammonium chloride in water in endothermic so the beaker becomes cold while that of sulphuric acid is exothermic.