Using concept of Faraday law, Now, An1*+n1e−→A Similarly, Bn2*+n2e−→B and, Cn3*+n3e−→C Since, charge is same then equivalent weight is same, ∴
2.1
7
n1
=
2.7
27
n2
=
7.2
48
n3
∴
3×n1
10
=
1×n2
10
=
3×n1
2×10
∴ n1=
n2
3
=
n3
2
∴ n1=1,n2=3 and n3=2 Hence, valencies of A, B and C are 1,3 and 2 .
