State the type of bonding present in the sodium chloride.

Identify the salt P from the observation given below.

The insoluble salt 'P' can be prepared by mixing $\mathrm{Pb}({\mathrm{NO}}_3{)}_2$ with $\mathrm{HCl}$.

Identify the salt 'Q' from the following observation:

When ammonium hydroxide is added to salt 'Q', a white gelatinous precipitate with formation of ${\mathrm{NH}}_4\mathrm{Cl}$ are obtained that is soluble in excess of ${\mathrm{NH}}_4\mathrm{OH}$.

Draw electron dot diagram to show the formation of the propanoic acid.

Draw electron dot diagram to show the formation of the methane.

State the observations using chemical equations for electrolysis of acidified water using $\mathrm{Pt}$ electrode.

State the observations using chemical equation for the electrolysis of ${\mathrm{CuSO}}_4$ solution using $\mathrm{Pt}$ electrode.