MHT CET · Chemistry · Solutions

Relative lowering in vapour pressure of a solution containing non volatile solute is the ratio of

A Number of moles of solute to number of moles of solvent.
B Number of moles of solvent to total number of moles of solution.
C Number of moles of solvent to number of moles of solute.
D Number of moles of solute to total number of moles of solution.

Verified Solution

Answer & Solution

Correct Answer

(D) Number of moles of solute to total number of moles of solution.

Step-by-step Solution

Detailed explanation

\(\left(\frac{P_{0}-P}{P_{0}}\right)=x_{2}=\frac{n_{2}}{n_{1}+n_{2}}\)

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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