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