For a solution formed by mixing liquids $L$ and $M$, the vapour pressure of $L$ plotted against the

Question

For a solution formed by mixing liquids $L$ and $M$, the vapour pressure of $L$ plotted against the mole fraction of $M$ in solution is shown in the following figure. Here $x_{L}$ and $x_{M}$ represent mole fractions of $L$ and $M$, respectively, in the solution. The correct statement(s) applicable to this system is(are)\ \

Professor PC Thomas Classes · Answer

$(\mathrm{a}, \mathrm{d})$ :\ As at point $Z$, the mole fraction of $M$ is zero, then ' $Z$ ' represents the vapour pressure of pure liquid $L$ and Raoult's law is obeyed when $x_{L} ightarrow 1$.\ The solution formed by mixing two liquids $L$ and $M$ exhibiting positive deviation from Raoult's law. Thus, intermolecular forces of attraction between $L-L$ in pure liquid $L$ and $M-M$ in pure liquid $M$ are stronger than that between $L-M$ in the solution.\