When a non-volatile solute is added to the solvent, the vapour pr… - Vidyadip

MCQ

When a non-volatile solute is added to the solvent, the vapour pressure of the solvent decreases by 10 mm of Hg . The mole fraction of the solute in the solution is 0.2 . What would be the mole fraction of the solvent if decrease in vapour pressure is 20 mm of Hg ?

✓
0.6
B
0.4
C
0.2
D
0.8

✓

Answer

Correct option: A.

0.6

(A)
$\because P ^{\circ}- P \propto X _{\text {solute }}$
and $\because 10 \propto 0.2$
$
\begin{array}{l}
\therefore 20 \propto 0.4 \\
\begin{aligned}
\therefore X_{\text {solvent }} & =1-X_{\text {solute }} \\
& =1-0.4 \\
\quad= & 0.6
\end{aligned}
\end{array}
$

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