Which of the following is a neutral oxide?

Bone black is a form of which element?

When $MnO_2$ and $H_2SO_4$ are added to a salt $(A)$,the greenish yellow gas liberated indicates that salt $(A)$ is:

White lead is

Consider the following reactions:
$Me_3SiCl \xrightarrow{H_2O} A$
$Me_2SiCl_2 \xrightarrow{H_2O} B$
$MeSiCl_3 \xrightarrow{H_2O} C$
$A$,$B$,and $C$ are known as . . . . . . , . . . . . . ,and . . . . . . respectively in silicones formation.

In the following reaction,identify the nature of the product formed by the complete hydrolysis of the underlined atom at $R.T.$:
$\underline{Cl}_2O_7 + H_2O \to HClO_4$