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# Vapour pressure of pure 'A' is 70 mm of Hg at 25$^{\large\circ}$C. It forms an ideal solution with 'B' in which moles fraction of A is 0.8. If the vapour pressure of the solution is 84 mm of Hg at 25$^{\large\circ}$C, the vapour pressure of pure 'B' at 25$^{\large\circ}$C is

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140mm
Hence (D) is the correct answer.
answered Jun 19, 2014