Among the halogen acid, the weakest acid is
HF
HCl
HBr
HI
Why was group 18 named as noble gases?
Octet electron configuration
Minute quantity in atmosphere
Chemical inactivity
Preparation of xenon and krypton compounds
Which chemical equation denotes the Plumbo solvency phenomenon?
3Pb + 2O2 → Pb3O4
2Pb + O2 + 2H2O → 2Pb(OH)2
2Pb + O2 → 2PbO
None of these
The most abundant element of group 15 is
Nitrogen
Antimony
Phosphorous
In electrolytic refining of Pb what accumulates to anode?
Impure lead
Pure lead
More electropositive impurities than Pb
Metallic impurities
