(a) State observation at the anode when aqueous copper sulphate solution is electrolysed using copper electrodes.

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

(c) Electrolysis of molten lead bromide is considered to be a redox reaction. Give reason.

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Solution

a) At the anode when aqueous copper sulphate solution is electrolyzed using copper electrodes. then nothing is left at the anode as copper atoms form copper ions and migrate towards the cathode

b) Graphite is an inert electrode which is preferred in the electrolysis of molten lead bromide because if other active electrodes are used then bromine will react with them.

c) During electrolysis of molten lead bromide lead gets oxidised and bromine gets reduced. Thus both oxidation and reduction occur simultaneously. So it is a redox reaction.

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Similar questions

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.

(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.

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