The coordination number of $Al$ in the crystalline state of $AlCl_3$ is

In the following reaction,identify the nature of the product formed by the complete hydrolysis of the underlined atom at $R.T.$:
$\underline{S}OCl_2 + H_2O \longrightarrow H_2SO_3 + HCl$

Silicon is an important constituent of which of the following?

Phosphorus has the oxidation state of $+3$ in

Give one method for industrial preparation and one for laboratory preparation of $CO$ and $CO_2$ each.

Bleaching powder loses its power on keeping for a long time because