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The vapour pressure of benzene at 90^@C ...

The vapour pressure of benzene at `90^@C` is 1020 torr. A solution of 5 g of a solute in 58.5 g benzene has vapour pressure 990 torr. The molecular weight of the solute is:

A

78

B

178

C

205

D

220

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The correct Answer is:
D
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