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Salts of A (atomic weight 7), B (atomic ...

Salts of `A` (atomic weight `7`), `B` (atomic weight `27`) and `C` (atomic weight `48`) were electolysed under idential condition using the same quanity of electricity. It was found that when `2.1 g` of `A` was deposited, the weights of `B` and `C` deposited were `2.7` and `7.2 g`. The valencies `A, B` and `C`respectively:

A

3,1 and 2

B

1,3 and 2

C

3,1 and 3

D

2,3 and 2

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The correct Answer is:
B
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