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:

Options

A. 1,3 and 2
B. 3,1 and 2
C. 2,6 and 3
D. 2,3 and 2

Answer

C