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Two elements A and B from compounds havi...

Two elements A and B from compounds having formula `"AB"_(2)` and `"AB"_(4)`. When dissolved in 20g of Benzene `(C_(6)H_(6))`, 1g of `"AB"_(2)` lowers the freezing point by 2.3 K whereas 1.0g of `"AB"_(4)` lowers it by 1.3 K. The molar depression constant for benzene is 5.1 K kg `"mol"^(-1)`. Calculate atomic masses of A and B.

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