Element \( \mathrm{A} \) (atomic mass \( =112 \) ) and element \( \mathrm{B} \) (atomic mass \( ...

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Element \( \mathrm{A} \) (atomic mass \( =112 \) ) and element \( \mathrm{B} \) (atomic mass \( =27 \) ) form chlorides. Solutions of these chlorides are electrolysed separately and it is found that when the same quantity of electricity is passed, \( 5.6 \mathrm{~g} \) of \( \mathrm{A} \) was deposited while only \( 0.9 \) \( \mathrm{g} \) of \( \mathrm{B} \) was deposited. The valency of \( \mathrm{B} \) is 3 . The valency of \( A \) is
(a) 1
(b) 2
(c) 3
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