is oxidised to Al (s).
(b) graphide
anode is oxidised to carbon monoxide and carbon dioxide.
(c) oxidation
state of oxygen changes in the reaction at anode.
(d) oxidation state
of oxygen changes in the overall reaction involved in the process.
Answer:
(b) In the
metallurgy of aluminium, electrolysis is performed in a steel vessel with
lining of carbon acts as cathode and graphite acts as anode. During this
process graphite anode is oxidised to CO and 
.
Chemical reaction
occurring in this process is as follows
This process
is known as Hall - Heroult process. The electrolytic reactions are
At cathode 
At anode 
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