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  4. 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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Q. 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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Solution:

As solution is cool to touch, dissolution is endothermic. Hence, high temperature will favour dissolution. Further, powdered sugar has large surface area and will dissolve faster.