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The vapour pressure of pure A is 10.0 torr and at the same temperature when 1 g of B is dissolved in 20 g of A, its vapour pressure is reduced to 9.0 torr. If the molecular weight of A is 200 a.m.u, then the molecular weight of B is
A. |
100 a.m.u |
B. |
90 a.m.u |
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C. |
75 a.m.u |
D. |
120 a.m.u |