8. On dissolving sugar in water at room temperature solution feels cool to touch. Under which of the following cases dissolution of sugar will be most rapid

a. Sugar crystals in cold water

b. Sugar crystals in hot water

c. Powered sugar in cold water

d. Powered sugar in hot water

Ans. d

Explanation : Dissolution of sugar in water will be most rapid when powered sugar is dissolved in hot water because powder form can easily insert in the vacancies of liquid particles. Further dissolution of sugar in water is an endothrmic process. Hence, high temperature will favour the dissolution of sugar in water.

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