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प्रश्न
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?
विकल्प
Sugar crystals in cold water.
Sugar crystals in hot water.
Powdered sugar in cold water.
Powdered sugar in hot water.
उत्तर
Powdered sugar in hot water.
Explanation:
(i) The solubility of a solute/sugar increases with increase in surface area of its particles. Powdered sugar has higher surface area, therefore, poedered sugar will dissolve most rapidly.
(ii) Since dissolution of sugar is attended with a cool feel to touch, it is an endothermic process. As per Lechatelier's principle an increase in temperature/using hot water would favour the dissolution of sugar.
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