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The vapour pressure of pure liquid A is ...

The vapour pressure of pure liquid A is 10 torr at at the same temperature when 9 g of B solid dissolved in 20 g of A, its Vapour pressure is reduced to 5 torr. If 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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