Two elements \( \mathrm{A} \) and \( \mathrm{B} \) form compounds of formula \( \mathrm{AB}_{2} ...

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Two elements \( \mathrm{A} \) and \( \mathrm{B} \) form compounds of formula \( \mathrm{AB}_{2} \) and \( \mathrm{AB}_{4} \). When dissolved in \( 20.0 \mathrm{~g} \) of benzene \( 1.0 \mathrm{~g} \) of \( \mathrm{AB}_{2} \) lowers F.pt. by \( 2.3 \mathrm{~K} \) whereas \( 1.0 \mathrm{~g} \) of \( \mathrm{AB}_{4} \) lowers F.pt. by \( 1.3 \mathrm{~K} \). The \( \mathrm{K}_{\mathrm{f}} \) for benzene is 5.4. The atomic masses of \( \mathrm{A} \) and \( \mathrm{B} \) are respectively
(1) 27,45
(2) 42,25
(3) 52,48
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