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
(i) and (ii)
B
(ii) and (iii)
C
(i) and (iv)
D
(iii) and (iv)

Solution

## The correct option is A (i) and (ii)When water reacts with quick lime, 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.Here $$(i)$$ Reaction of water with quicklime and $$(ii)$$ Dilution of acid are the exothermic reaction.$$CaO+H_2O\longrightarrow Ca(OH)_2+Heat$$$$H_2SO_4+H_2O\longrightarrow H_3O^{+}+HSO_4^-+Heat$$Chemistry

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