The vapour pressure of pure A is 10 torr...

The vapour pressure of pure A is 10 torr and at the same temperature when 1g of 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

100 amu

90 amu

75 amu

120 amu

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