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Assertion (A) When NaCl is added to wate...

Assertion (A) When NaCl is added to water a depression in freezing point is observed.
Reason (R ) The lowering of vapour pressure of a solution causes depression in the freezing point.

A

Assertion is false but reason is true

B

Assertion is true but reason is false

C

Both assertion and reason are true, but reason is not a true explanation for assertion

D

Both assertion and reason are true and reason is the correct explanation for assertion

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The correct Answer is:
D
On addition of nonvolatile solute (viz. NaCl) to water NaCl solution is formed . Due to relatively lesser number of water molecules at the surface of liquid, the solution exerts a lower vapour pressure as compared to that of pure water . It is because of this lowering of vapour pressure that a depression in freezing point of water is observed
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