Question

Anodes needs to replaced from Time to time during the electrolysis is aluminua why ?
Tell the exact reason .
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Answer 1

Answer:

(1) During electrolysis of alumina, the oxygen liberated at the carbon anode reacts with graphite rods (carbon anode) and forms carbon dioxide. (2) As the anodes gets oxidised during electrolysis of alumina, they are continuously eroded. Hence, it is necessary to replace anodes from time to time.

Explanation:

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Answer 2

Answer:

i. During the electroylis of alumina, oxygen gas is liberated at the anode.

ii. Oxygen reacts with the graphite anode to form carbon dioxide.

iii. Thus, the mass of graphite rods decreases over the time.

Hence, anodes need to be replaced from time to time during the electrolysis of

alumina.