Chemistry
During the extraction of aluminium by Hall Heroult’s process, the carbon rods are replaced continuously. This is because:
- It minimises heat loss by radiation.
- It enhances the mobility of ions.
- The carbon anode is consumed.
- It lowers the fusion point.
Metallurgy
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Answer
The carbon anode is consumed.
Reason — During the extraction of aluminium by Hall Heroult’s process, the carbon rod are replaced time to time, as it get oxidised by the oxygen evolved at the anode and get consumed.
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