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Question

The vapour pressure of a solution of a non-volatile electrolyte (A) in a solvent (B) is 95% of the vapour pressure of the solvent at the same temperature. If MB=0.3MA, where MA and MB are molecular weights of (A) and (B) respectively, then the weight ratio of the solvent and solute are

A
69.8
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B
66.6
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C
5.7
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D
76.6
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Solution

The correct option is C 5.7
PoPsPo=xsolute=wtsoluteMsolutewtsoluteMsolute+wtsolventMsolvent

Po0.95PoPo=wtsoluteMsolutewtsoluteMsolute+wtsolvent0.3Msolute

0.05=0.3wtsolute0.3wtsolute+wtsolvent

1+wtsolvent0.3wtsolute=10.05=20

wtsolventwtsolute=19×0.3=5.7

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