Question

# Which of the following sentences is true?

A
Relative lowering of vapor pressure of an ideal solution containing a non-volatile solute is equal to the mole fraction of the solute at a given temperature
B
Relative lowering of vapor pressure of an ideal solution containing a non-volatile solute is equal to the mole fraction of the solvent at a given temperature
C
Relative lowering of vapor pressure of an ideal solution containing a non-volatile solute depends on the nature of the solute at a given temperature
D
Relative lowering of vapor pressure of an ideal solution containing a non-volatile solute depends on the nature of the solvent at a given temperature

Solution

## The correct option is A Relative lowering of vapor pressure of an ideal solution containing a non-volatile solute is equal to the mole fraction of the solute at a given temperatureRelative lowering of vapor pressure of an ideal solution containing a non-volatile solute is equal to the mole fraction of the solute at a given temperature.If $$p^o_A$$ is the vapor pressure of pure solvent. And $$p_A$$ is the vapor pressure of the ideal solution after a non-volatile solute is added.The relative lowering of vapor pressure of the solution becomes $$\dfrac{p^o_A-p_A}{p^o_A}$$$$=$$$$X_B$$, where $$X_B$$ is the mole fraction of solute.Chemistry

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