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Q.

The correct option for the value of vapour pressure of a solution at 450C with benzene to octane in molar ratio 3 : 2 is
[At  450C, vapour pressure of benzene is 280 mm Hg and that of octane is 420 mm Hg. Assume ideal gas.]

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a

350 mm of Hg 

b

160 mm of Hg

c

168 mm of Hg

d

336 mm of Hg

answer is D.

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Detailed Solution

Given

nC6H6  :   nC8H8   =    3 : 2

XBenzene=35;XOctane=25

Vapour pressure of solution  (Ps)

= PC6H6oXC6H6+PC8H18oXC8H18

=280×35+420×25

=168 + 168 = 336 mm of Hg

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