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 xL and xM represent mole fractions of L and M, respectively, in the solution. The correct statement(s) applicable to this system is (are)

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Attractive intermolecular interactions between L-L in pure liquid L and M-M in pure liquid M are stronger than those between L-M when mixed in solution

The point Z represents vapour pressure of pure liquid M and Raoult’s law is obeyed when xL→0

The point Z represents vapour pressure of pure liquid M and Raoult’s law is obeyed from xL=0 to xL=1

The point Z represents vapour pressure of pure liquid L and Raoult’s law is obeyed when xL→1

answer is A.

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Detailed Solution

As actual is above expected idealÞ +ve deviationÞ L – L attraction > L – M attractionAlso m –m attraction > L – M attraction Pt. z XL=1⇒ only ' L ' is present ⇒PL=PL,PM=0 ) ⇒ZPL>PL0From point Q to Z the graph (actual) is very similar to expected ideal behavior Þ whereXL→1 it mm ideal behavior.

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