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On dissolving sugar in water at room temperature

Question:

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?

(i) Sugar crystals in cold water.

(ii) Sugar crystals in hot water.

(iii) Powdered sugar in cold water.

(iv) Powdered sugar in hot water.

Solution:

Option (iv) Powdered sugar in hot water is the answer.

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