Reaction occurs at anode in the electrolysis of fused $\mathrm{NaCl}$is

An aqueous solution of nickel (II) sulphate was electrolyzed using nickel electrodes. Observe the diagram and answer the question that follows:

• Which equation for the reaction at the anode is correct?

Which one of the following statements is correct for electrolysis of brine solution?

An aqueous solution of nickel (II) sulphate was electrolyzed using nickel electrodes. Observe the diagram and answer the question that follows:

• Name the cation that remains as a spectator ion in the solution.

An aqueous solution of nickel (II) sulphate was electrolyzed using nickel electrodes. Observe the diagram and answer the question that follows:

• What do you observe at the cathode and anode respectively?

The $\mathrm{pH}$ of the solution _________ during the electrolysis of dilute aqueous solution of ${\mathrm{CuSO}}_4.$