Which is the general electronic configuration of group 15 elements?
ns2 np3
ns2 np2
ns2 np4
ns2 np6
In electrolytic refining of Pb what constitute cathode is
Pure lead
Impure lead
More electropositive impurities than Pb
Metallic impurities
The electrolyte in electrolytic refining of Pb is
Lead fluosilicate
Hydrofluosilicic Acid
Both a and b
None of these
