Q 1200191918.     The vapour pressure of two pure liquids `A` and `B` that form an ideal solution, are `400` and `800` mm of `Hg` respectively at a temperature `T°C`. Find the mole fraction of `A` in a solution of `A` and `B` whose boiling point is ` T°C`.

A

`0.1`

B

`0.2`

C

`0.4`

D

`0.8`

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