Chemistry
In electrolysis of molten lead bromide
(a) State the reaction taking place at the cathode.
(b) Which electrode: anode or cathode is the oxidising electrode ? Why?
Electrolysis
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Answer
(a) Pb2+ + 2e- ⟶ Pb
(b) The anode is the oxidising electrode because bromide ions give up electrons there, producing bromine gas:
Br1- - 1e- ⟶ Br
Br + Br ⟶ Br2
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