The formation of $Al_2O_3$ involves the evolution of a large quantity of heat,which makes its use in:

Silicon is the main constituent of

Which of the following species is not a pseudohalide?

Under hydrolytic conditions,the compounds used for preparation of linear polymer and for chain termination,respectively,are

In the following reaction,identify the nature of the product formed by the complete hydrolysis of the underlined atom at $R.T.$:
$H_2\underset{-}{S}_2O_7 + H_2O \longrightarrow 2H_2SO_4$

Give the use of diamond.