The products formed when gaseous $HCl$ is passed into an aqueous $Na_2SO_3$ solution are:

$SiCl_4$ on hydrolysis gives:

Which of the following does not exist?

Which of the following is a metalloid?

Silicon dioxide is formed by the reaction of:

$A$ 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.