The treatment of zinc with very dilute nitric acid produces

In the following reaction,assign the state for the underlined atom in the product of complete hydrolysis at $R.T.$:
$\underline{S}F_4 + H_2O \longrightarrow H_2SO_3 + HF$

Which among the following oxides is amphoteric in nature?

Explain the difference in properties of diamond and graphite on the basis of their structures.

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 $Sn$.

When graphite is heated at $300^{\circ} C$ with potassium vapour, it forms $C_8K$ compound that shows one of the following property.