When lead nitrate is heated,it gives

White lead is

The $C-C$ bond length is maximum in

Which of the following statements is $NOT$ true?

The option$(s)$ with only amphoteric oxides is(are)
$[A]$ $Cr_2O_3, BeO, SnO, SnO_2$
$[B]$ $Cr_2O_3, CrO, SnO, PbO$
$[C]$ $NO, B_2O_3, PbO, SnO_2$
$[D]$ $ZnO, Al_2O_3, PbO, PbO_2$

Explain the oxidation states of group $14$ elements.