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Q.

Which of the following are exothermic processes?

(i) Reaction of water with quick lime

(ii) Dilution of an acid

(iii) Evaporation of water

(iv) Sublimation of camphor (crystals)

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a

(i) and (ii)

b

(iii) and (iv)

c

(ii) and (iii)

d

(i) and (iv)

answer is A.

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Detailed Solution

detailed_solution_thumbnail

In the reaction of water with quick lime and dilution of acid, heat is liberated. Hence these two reactions are exothermic reactions. Evaporation of water and sublimation of camphor requires an external heat supply is needed so they are endothermic reactions.

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