Assertion: The vapour pressure of a liquid decreases if some non-volatile solute is dissolved in it. Reason: The relative lowering of vapour pressure of a solution containing a non-volatile solute is equal to the mole fraction of the solute in the solution.

Question

Assertion: The vapour pressure of a liquid decreases if some non-volatile solute is dissolved in it. Reason: The relative lowering of vapour pressure of a solution containing a non-volatile solute is equal to the mole fraction of the solute in the solution. (A) If both assertion and reason are true and reason is the correct explanation of assertion (B) If both assertion and reason are true but reason is not the correct explanation of assertion (C) If assertion is true but reason is false (D) If both assertion and reason are false

Tardigrade Admin · Accepted Answer

On adding a non volatile solute in a liquid the vapour pressure decreases because some molecules of the solvent on the surface are replaced by the molecules of the solute.

Q. Assertion : The vapour pressure of a liquid decreases if some non-volatile solute is dissolved in it. Reason : The relative lowering of vapour pressure of a solution containing a non-volatile solute is equal to the mole fraction of the solute in the solution.

If both assertion and reason are true and reason is the correct explanation of assertion

If both assertion and reason are true but reason is not the correct explanation of assertion

If assertion is true but reason is false

If both assertion and reason are false

On adding a non volatile solute in a liquid the vapour pressure decreases because some molecules of the solvent on the surface are replaced by the molecules of the solute.

Q. Assertion : The vapour pressure of a liquid decreases if some non-volatile solute is dissolved in it.
Reason : The relative lowering of vapour pressure of a solution containing a non-volatile solute is equal to the mole fraction of the solute in the solution.