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Q.

The relative lowering of vapour pressure is equal to

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a

 Ratio of the number of solute molecules to the total number of molecules in solution

b

Ratio of the number of solvent molecules to the number of solute molecules

c

Ratio of the number of solvent molecules to the total number of molecules in solution

d

Ratio of the number of solute molecules to the number of solvent molecules    

answer is A.

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Detailed Solution

The relative lowering of vapour pressure is equal to mole fraction of a solute. After addition of solute in solvent, its vapour pressure decreases.

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