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Two elements A and B form compounds having formula $AB_2$ and $AB_4$. When dissolved in 20 g of benzene ($C_6H_6$), 1 g of $AB_2$ lowers the freezing point by 2.3 K whereas 1.0 g of AB4 lowers it by 1.3 K. The molar depression constant for benzene is $5.1 Kkg mol^{−1}$. Calculate atomic masses of A and B.

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Hence (A) is the correct answer.
answered Jun 16, 2014 by sreemathi.v
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