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

Salts of A (atomic weight 7), B (atomic weight 27) and C (atomic weight 48) were electrolysed under identical condition using the same quantity of electricity. It was found that when 2.1 g of A was deposited, the eight of B and C deposited were 2.7 and 7.2 g. The valencies of A,B and C are respectively :

`3,1 and 2`

`1,3 and 2`

`3,1 and 3`

`2,3 and 2`

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