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The vapour pressure of high b.pt. liquid...

The vapour pressure of high `b.pt.` liquids is……..then the vapour pressure of a low boiling liquid:

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This statement is true. If vapour pressure of a liquid in high, lesser heating is needed to make its vapour pressure equal to the external pressure (atmospheric pressure). Therefore, its boiling point is lower.
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The vapour pressure of a pure liquid A is 40 mm Hg at 310 K . The vapour pressure of this liquid in a solution with liquid B is 32 mm Hg . The mole fraction of A in the solution, if it obeys Raoult's law, is:

The vapour pressure of a pure liquid A is 40 mm Hg at 310 K . The vapour pressure of this liquid in a solution with liquid B is 32 mm Hg . Mole fraction of A in the solution , if it obeys Raoult's law is :