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(A) When NaCl is added to water, a depression in freezing point is observed.(B) The lowering of vapour pressureof a solution causes depression in the freezing point.

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When non volatile solute like NaCl is added to water the vapour pressure decreases. This decrease is “due to decrease in availability of free surface area, which is replaced by solute particles. This lowering in the vapour pressure lead to depression in freezing point.
Hence both assertion and reason are correct.

Final Answer:

When non volatile solute water the vapour like Nall is added to water the pressure decreases. This decaase “due to decrease in availability of fru surface area, which is replaced by solute particles. This lowering in the vapour pressure lead to depression in freezing point.Hence both assertion and reason are correct.

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