The common basic structural unit in silicates and silica is

Consider the following reactions:
$PCl_{3} + 3H_{2}O \longrightarrow A + 3HCl$
$A + H_{2}O \longrightarrow B + HCl$
Identify the number of ionisable protons present in the product $B$.

Which of the following substances is the most volatile among $CH_4, SiH_4, GeH_4, SnH_4$?

On heating copper nitrate strongly,$.......$ is finally obtained.

In $P_4O_{10}$,the number of oxygen atoms attached to each phosphorus atom is

Give reasons: $A$ mixture of dilute $NaOH$ and aluminium pieces is used to open blocked drains.