Liquids A and B have vapour pressures pA and pB, respectively, with pA>pB. The plot of 1/ptotal  versus yA (mole fraction of A in vapour phase)

  1. A

    is linear with positive slope

  2. B

     is linear with negative slope 

  3. C

    increases nonlinearly

  4. D

    decreases nonlinearly

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    Solution:

    Mole fraction of A in vapour phase

     YA=PAXAPtotal 

    The plot of 1/ptotal  versus yA   is linear with negative slope .

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