Detailed Explanation:

Exothermic processes release heat to surroundings; endothermic processes absorb heat.

i. Evaporation of water – absorbs heat from surroundings (endothermic).

ii. Dilution of H₂SO₄ – releases large amount of heat when water is added (exothermic).

iii. Reaction of water with quick lime (CaO) – forms slaked lime with vigorous heat release (exothermic).

iv. Sublimation of camphor – solid to gas transition requires heat absorption (endothermic).

Only ii and iii are exothermic.