Consider a binary mixture of volatile liquids. If at XA=0.4 the vapour pressure of solution is 580 torr then the mixture could be (pAo=300 torr, pBo=800 torr):

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CHCl3-CH3COCH3

C6H5Cl-C6H5Br

C6H6-C6H5CH3

nC6H14-nC7H16

answer is A.

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Detailed Solution

It shows negative deviation from Raoult's law ps (actual) = 580 torrps (Raoult) =0.4×300+0.6×800=600 torr.

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