At a given temperature
a) Vapour pressure of a solution containing nonvolatile solute is proportional to mole fraction of solvent
b) Lowering of vapour pressure of solution containing nonvolatile solute is proportional to mole fraction of solute
c) Relative lowering of vapour pressure is equal to mole fraction of solute
The correct combination is

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a, b and c only

a, b only

a only

b, c only

answer is C.

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Detailed Solution

For solutions containing non - volatile solutes , the Raoult's law may be stated as at a given temperature, the vapour pressure of a solution containing non - volatile solute is directly proportional to the mole fraction of the solvent(volatile component).

Relative lowering of vapour pressure is a colligative property and depend on the amount of solute present. This is based on Raoult's law.

Hence, all are correct statements.

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