Name the kind of particles present in:

(i) Sodium hydroxide soln.

(ii) Carbonic acid.

(iii) Sugar soln.

M₂O is the oxide of a metal 'M' which is the above hydrogen in the activity series. M₂O when dissolved in water forms the corresponding hydroxide which is a good conductor of electricity.

(i) State the reaction taking place at the cathode.

(ii) Name the product at the anode.

Give scientific reasons :

(i) During electrolysis of molten lead bromide, graphite anode is preferred to other electrodes.

(ii) Electrical conductivity of acetic acid is less in comparison to that of dil. H₂SO₄ – at a given concentration.

(iii) Electrolysis of molten lead bromide is considered to be a redox reaction.

Differentiate between the terms strong electrolyte and weak electrolyte. (stating any two differences)