Give reason for the following:
Electrolysis of molten led bromide is considered to be a reaction in which oxidation and reduction go side by side, i.e., a redox reaction.

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Solution

During electrolysis of lead bromide, there is loss of electrons at anode by bromide and gain of electrons at cathode by lead. Thus oxidation and reduction go side by side. Therefore, it is redox reaction.

$P b B r_{2} ⇋ P b (s) + B r_{2} (g)$

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

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(h) A graphite anode is preferred to other inert electrodes during electrolysis of fused lead bromide.

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