State True or False for the following statements:
$(1)$ Oxides of indium and thallium are basic in their properties.
$(2)$ $C$,$Si$ are non-metals,while germanium,tin,and lead are high melting metals.

Number of oxygen atoms present in the chemical formula of fuming sulphuric acid is . . . . .

Silicon has a strong tendency to form polymers like silicones. The chain length of silicone polymer can be controlled by adding :-

The number of $S-S$ bonds in the cyclic trimer of sulfur trioxide is .........

Red lead is

$A$ compound $A$ is used in paints instead of salts of lead. Compound $A$ is obtained when a white compound $B$ is strongly heated. The compound $B$ is insoluble in water but dissolves in $NaOH$ solution,forming a solution of compound $C$. The compound $A$ on heating with coke gives a volatile metal $D$ and a gas $E$ which burns with a blue flame. Identify the possible species $D$ and $C$ respectively.