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)

The particles present in strong electrolytes are:

Select the correct answer from A, B, C and D:

A: only molecules
B: mainly ions
C: ions and molecules
D: only atoms

Write equations for the reactions taking place at the two electrodes during the electrolysis of:

(i) Acidified CuSO₄ solution with copper electrodes.

(ii) Molten PbBr₂ with inert electrodes. (mention clearly the name of the electrode in each case)