####36. The vapour pressure of the solution $M$ is
(a) $39.3 mm Hg$
(b) $36.0 mm Hg$
(c) $29.5 mm Hg$
(d) $28.8 mm Hg$
$$ \begin{aligned} & =32.8 \times 0.1+40 \times 0.9 \ & =3.28+36 \ & =39.28 mm \end{aligned} $$
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