For a good quality cement,the ratio of silica to alumina is found to be

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.

Find the non-semiconductor element among the following.

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

In $C_{60}$,all carbon atoms are .......

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