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Q.

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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a

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

 

b

If both (A) and (R) are false

c

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

 

d

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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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.