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Question

In Hall-Heroult process, the product obtained at the anode is:

A
Aluminium
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B
Oxygen
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C
Fluorine
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D
Alumina
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Solution

The correct option is B Oxygen

In Hall-Heroult’s Process, alumina is dissolved into cryolite, whose melting point is more manageable.
The reactions involved at cathode and anode are as follows:
At Cathode:
2Al3++6e2Al
At Anode:
2Al2O32Al3++3O2
3O23/2O2+6e
So, the product obtained at anode is oxygen.


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