Question

Which of the following are exothermic processes?

(i) Reaction of water with quicklime

(ii) Dilution of an acid

(iii) Evaporation of water

(iv) Sublimation of camphor (crystals)

• A. (iii) and (iv)
• B. (i) and (ii)
• C. (i) and (iv)
• D. (ii) and (iii)

Answer 1

The correct option is B (i) and (ii)

When water reacts with quicklime, calcium hydroxide is formed along with the release of heat. Thus, it is an exothermic reaction. The process of diluting a concentrated acid is a highly exothermic process.
Evaporation of water and sublimation of camphor are examples of endothermic reactions.