Salts of A (atomic weight \( =7 \) ), B (atomic weight \( =27 \) ) and C (atomic weight \( =48 \...

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Salts of A (atomic weight \( =7 \) ), B (atomic weight \( =27 \) ) and C (atomic weight \( =48 \) ) were electrolysed under identical conditions using the same quantity of electricity. It was found that when \( 2.1 \mathrm{~g} \) of A was
\( P \) deposited, the weights of \( \mathrm{B} \) and \( \mathrm{C} \) deposited were \( 2.7 \) and \( 7.2 \mathrm{~g} \). The valencies of A, B and C

W. respectively are
(A) 3,1 and 2
(B) 1,3 and 2
(C) 3,1 and 3
(D) 2,3 and 2
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