Question

Question 12

Which of the following is (are) an endothermic process(es)?

(i) Dilution of sulphuric acid.
(ii) Sublimation of dry ice.
(iii) Condensation of water vapours.
(iv) Evaporation of water.

(a) (i) and (iii)
(b) (ii) only
(c) (iii) only
(d) (ii) and (iv)

Answer 1

Option (d) is correct.

Sublimation of dry ice and evaporation of water are endothermic in nature since they absorb heat energy from their surroundings to sublime or evaporate. And both these processes produce cooling.

Dilution of sulphuric acid and condensation of water vapour evolve heat. Hence, these are exothermic processes.