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# The relative lowering of vapour pressure is equal to:

(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 solute molecules to the number of solvent molecules.

(d) ratio of the number of solvent molecules to the total number of molecules.

(a) ratio of the number of solute molecules to the total number of molecules in solution.