Question

(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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Answer 1

Answer:

a) State one relevant observation for the following: At the anode when aqueous copper sulphate solution is electrolyzed using copper electrodes. Nothing is left at the anode as copper atoms form copper ions and migrate towards the cathode.

b) Solution. During the electrolysis of molten lead bromide, a graphite anode is preferred because graphite remains unaffected by the reactive bromine vapors which are released at the anode.

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

Answer 2

Explanation:

1. nothing is left at the anode as copper atoms from copper ions and migrates towards the cathode

2.During the electrolysis of molten lead bromide, a graphite anode is preferred because graphite remains unaffected by the reactive brominevapors which are released at the anode.

3.During the electrolysis of molten lead bromide, agraphite anode is preferred because graphiteremains unaffected by the rea