Soln:

i) Ionic theory.

• During electrolytes dissolve in water to dissolve in water to dissociate their molecules, their dissociation is called IONIZATION.
• The dissociation of molecules yields positive charge (CATION) and Negative charge.
• Positive charge migrates to the cathode electrode and negative charge migrate to Anode electrode.

ii) Migration of ions.

• This is the movement of positive and negative charged particles to their respective electrode when electric circuits are connected.
• Positive charge (cation) move to the cathode electrode while negative charged particles (Anion) move to the Anode electrode.