question_answer 50)

  Which among the following changes are exothermic or endothermic in nature? (i) Decomposition of ferrous sulphate (ii) Dilution of sulphuric acid (iii)Dissolution of sodium hydroxide in water (iv) Dissolution of ammonium chloride in water

Answer:

  (a) Decomposition of ferrous sulphate is an endothermic reaction because heat is absorbed during the reaction. (b) The process of dissolving sulphuric acid in water i.e., dilution of sulphuric acid) is a highly exothermic reaction. (c) The process of dissolving sodium hydroxide (a bare) in water is again a high lyexo thermic reaction. (d) Dissolution of ammonium chloride in water is an endothermic reaction as heat is absorbed during the reaction.