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?

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Powdered sugar in cold water

Sugar crystals in cold water

Powdered sugar in hot water

Sugar crystals in hot water

answer is D.

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Detailed Solution

Dissolution of sugar in water will be most rapid, when powdered sugar is dissolved in hot water because powdered form can easily insert in the vacancies of liquid particles. Further dissolution of sugar in water is an endothermic process (as cooling is Produced). Hence, high temperature will favour the dissolution of sugar in water.

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