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The vapour pressure of pure liquid A is ...

The vapour pressure of pure liquid A is `10` torr and at the same temperature when `1` g solid B is dissolved in `20`g of A , its vapour pressure is reduced to`9.0`torr . If the molecular mass of A is `200`amu , then the molecular mass of B is

A

100 amu

B

90 amu

C

75 amu

D

120 amu

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The correct Answer is:
B
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