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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
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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
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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
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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
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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 temperature
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.
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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