Thermodynamically,the most stable form of carbon is

Identify the incorrect statements from the following:
$I.$ Tin in $+2$ state acts as a reducing agent,while lead in $+4$ state acts as a strong oxidising agent.
$II.$ Silicon exists as both $[SiF_6]^{2-}$ and $[SiCl_6]^{2-}$ forms.
$III.$ The hybridisation of carbon in fullerene is $sp^3$.
$IV.$ Among $Ge$,$Sn$,and $Pb$,the lowest melting point is for $Sn$.

Which allotropic form of carbon does not have hexagonal rings in its structure?

Observe the oxides $CO, B_2O_3, SiO_2, CO_2, Al_2O_3, PbO_2, Tl_2O_3$. The number of acidic oxides in the list is:

Of the following acids,the one which has the capability to form complex compounds and also possesses both oxidizing and reducing properties is:

Under hydrolytic conditions,the compounds used for preparation of linear polymer and for chain termination,respectively,are