Lead is soluble in:

What are silicones?

Choose the correct statements about allotropes of carbon:
$I$. Graphite has a layered structure.
$II$. Buckminsterfullerene is not aromatic in nature.
$III$. The distance between two adjacent layers in graphite is $340 \ pm$.
$IV$. The hybridization of carbons in graphite and Buckminsterfullerene is the same $(sp^2)$.

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

Which of the following oxides is amphoteric in character?

$C_{60}$,an allotrope of carbon,contains: