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Acetone has a vapour pressure of and ether at . For a liquid mixture of acetone and ether containing mole fraction of acetone, the partial pressure of ether is:

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Benzene and toluene form an ideal solution over the entire range of composition. The vapour pressure of pure benzene and toluene at are and , respectively. What is the mole fraction of toluene in vapour phase when of benzene is mixed with of toluene?
(Molar mass of benzene and toluene are and , respectively)

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The correct option for the value of vapour pressure of a solution at with benzene to octane in molar ratio is:
[At vapour pressure of benzene is and that of octane is Assume Ideal gas]

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(Given that the vapour pressure of pure liquid A is at temperature )

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