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Q.

The vapour-pressure lowering of a solvent is proportional to

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a

the normality of the solution

b

 the mole fraction of the solvent 

c

 the molality of the solvent

d

the mole fraction of the solute

answer is A.

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Detailed Solution

Here,

ppkpρ=X2( Raoult'slaw) 

Thus, The vapour-pressure lowering of a solvent is proportional to the mole fraction of the solute.

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The vapour-pressure lowering of a solvent is proportional to