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Question

Assuming the formation of an ideal solution, the boiling point of a mixture containing 1560 g benzene (molar mass =78) and 1125 g chlorobenzene (molar' mass = 112.5)' using the given vapour pressure vs. temperature diagram against anexternal pressure of 1000 torr, is :
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A
90oC
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B
100oC
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C
110oC
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D
120oC
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Solution

The correct option is B 100oC
χbenzene=1560/781560/78+1125/112.5=23,χchlorobenzene=13
At boiling point, vapour pressure of solution should be 1000 torr.
At 100oC, from the graph,
Pchlorobenzene250×13torr
Also, Pbenzene=23×1300
Total vapour of solution at 100oC=2503+26003=950torr, (closest to 1000 torr)
Hence (B) is the correct answer.

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