Q. Give reasons for the following :
(a) Electrolysis of molten lead bromide is considered to be a reaction in which oxidation and reduction go side, i.e., a redox reaction.
(b) The blue colour of aqueous copper sulphate fades when it is electrolysed using platinum electrodes.
(c) Lead bromide undergoes electrolytic dissociation in the molten state but is a non- electrolyte in the solid state.
(d) Aluminium is extracted from its oxide by electrolytic reduction and not by conventional reducing agents.
(e) The ratio hydrogen and oxygen formed at the cathode and anode is 2: 1 by volume.
(f) In the electrolysis of acidified water, dilute sulphuric acid is preferred to dilute nitric acid for acidification.
(g) Ammonia is unionised in the gaseous state but in the aqueous solution, it is a weak electrolyte.
(h) A graphite anode is preferred to other inert electrodes during electrolysis of fused lead bromide.
(i) For electroplating with silver, silver nitrate is not used as the electrolyte.
(j) Carbon tetrachloride is a liquid but does not conduct an electrolyte.
(k) Potassium is not extracted by electrolysis of its aqueous salt solution.
