The relative lowering in vapour pressure is proportional to the ratio of number of :
A
solute molecules to solvent molecules
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B
solvent molecules to solute molecules
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C
solute molecules to the total number of molecules to the total number of molecules in solution
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D
solvent molecules to the total number of molecules in solution
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Solution
The correct option is C solute molecules to the total number of molecules to the total number of molecules in solution Relative lowering of vapour pressure. The vapour pressure of a liquid is the pressure of the vapor which is in equilibrium with that liquid. The vapour pressure of a solvent is lowered when a non-volatile solute is dissolved in it to form a solution.