Question

Which among the following changes are exothermic or endothermic in nature?

(a) Decomposition of ferrous sulphate

(b) Dilution of sulphuric acid

(c) Dissolution of sodium hydroxide in water

(d) Dissolution of ammonium chloride in water

Answer 1

(b) and (c) are exothermic as heat is released in these changes. 

(a) and (d) are endothermic as heat is absorbed in these changes