On strongly heating $Pb(NO_3)_2$ crystals,the gas formed is

In the following reaction,identify the nature of the product formed by the complete hydrolysis of the underlined atom at $R.T.$:
$\underline{P}_4O_6 + H_2O \longrightarrow H_3PO_3$

Identify the cyclic silicate ion given in the figure below:

When lead nitrate is heated,it gives

$P_2O_5$ is used extensively as a

Anhydrous sample of ferric chloride is prepared by heating: