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).

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(i) and (ii)

(ii) and (iii)

(i) and (iv)

(iii) and (iv)

answer is A.

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Detailed Solution

Concept- Calcium hydroxide is created when water and quicklime react, coupled with the release of heat. It is an exothermic reaction as a result. A concentrated acid must be diluted, which is a very exothermic process.
Examples of endothermic reactions are the evaporation of water and the sublimation of camphor.
Here, the first reaction is the reaction of water with quicklime and the second reaction depicts the dilution of acid as the exothermic reaction.

Hence, the correct answer is option (1).

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