Q.

The following graph represents variation of boiling point with composition of liquid and vapours of binary liquid mixture. The graph is plotted at constant pressure.
Which of the following statement(s) is incorrect? Here X & Y stands for mole fraction in liquid and vapour phase respectively.
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a

Xbenzene=0.7  and  Ytoluene=0.4

b

Xbenzene=0.3  and  Ytoluene=0.4

c

Xtoluene=0.3  and  Ybenzene>0.7

d

If Xbenzene=0.7  and  Ytoluene<0.3

answer is A.

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Detailed Solution

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Benzene more volatile than toluene
Hence from figure
Statement (3) is correct  Xbenzene=0.7  and  Ytoluene=0.4
                                       Xbenzene=0.3  and  Ytoluene=0.4
Statement (4) is correct because  Xbenzene=0.7  {Ybenzene>0.7}
                                                        Ytoluenenecessarily<0.3
Statement (1) incorrect: because 4 option is correct
Statement (2) is correct:  Xtoluene=0.3    Ybenzene=0.7
                                                      Ybenzenemustbe>0.7

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