In electrolytic refining of Pb what accumulates to anode?
Impure lead
Pure lead
More electropositive impurities than Pb
Metallic impurities
Electronic configuration of group 16 elements is
ns2np4
ns2np3
ns2np5
ns2np6
Among the halogen acid, the weakest acid is
HF
HCl
HBr
HI
Lead is used as
Telephone wires
Additive to petrol
For making alloys
All of the above
Why was group 18 named as inert gases?
minute quantity in atmosphere
chemical inactivity
both a and b
none of these
