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The metal extracted industrially by the Hall–Héroult electrolytic process is
Acopper
Bzinc
Caluminium
Dnickel
Answer & Solution
Correct answer: C. aluminium
1. Reactive metals whose oxides cannot be reduced by carbon are obtained by electrolysis.
2. In the **Hall–Héroult process**, molten alumina dissolved in cryolite is electrolysed to give aluminium at the cathode.
3. Copper and nickel are refined electrolytically but are not extracted by Hall–Héroult; zinc is obtained by carbon reduction.
_Source: Samacheer Kalvi Class 12 Chemistry Vol.1, Unit 1 'Metallurgy', §1.5.1_
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