Give reason for the following:
(a) “Electrolysis of molten lead 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 (PbBr2), there is a loss of electrons at the anode by bromide and gain of electrons at cathode by lead.

At anode:

$B r^{-}$ − $e^{-}$ →Br
Br + Br → $B r_{2}$

At cathode:

$P b^{2} +$ + $2 e^{-}$ →Pb(s)

Thus, oxidation and reduction go side by side. Therefore, it is a redox reaction.

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