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In a solution containing two volatile co...

In a solution containing two volatile components the mole fractions are `x_(1)` and `x_(2)`.If the V.P.of pure components are `p_(1)` and `p_(2)` respectively,the V.P.of the solution is , `1) x_(1)p_(1)-x_(2)P_(2)` `2) x_(2)P_(2)-x_(1)P_(1)` `3) x_(1)p_(1)+x_(2)p_(2)` `4) x_(1)P_(2)+x_(2)P_(1)`

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