The vapour pressure of pure liquid A is 10 torr and at the same temperature when...

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