Assertion (A): A non volatile solute is added in liquid solvent the freezing point of mixture decreases.
Reason (R): Vapour pressure decreases by addition of non volatile solute, so equilibrium point where V.P. of solid and V.P. of liquid are equal can reach at lower temp.

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If both (A) and (R) are true and (R) is not the correct explanation of (A)

If both (A) and (R) are false

If both (A) and (R) are true and (R) is the correct explanation of (A)

If (A) is true but (R) is false

answer is A.

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Detailed Solution

When a non-volatile solute is added in solvent liquid then freezing point of mixture decreases. On adding a non volatile solute in a liquid the vapour pressure decreases because some molecules of the solvent on the surface are replaced by the molecules of the solute.

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