Aluminium is extracted by
AHeating bauxite in air at red heat
BCarbon reduction of alumina in a blast furnace
CElectrolysis of fused alumina with cryolite
DBoiling bauxite in dilute sulphuric acid
Answer & Solution
Correct answer: C. Electrolysis of fused alumina with cryolite
1. Aluminium is highly reactive; carbon cannot reduce its oxide.
2. Alumina is dissolved in fused cryolite for electrolysis.
3. Hall-Heroult cell uses carbon electrodes.
4. At the cathode, Al3+ ions accept electrons and pure Al forms.
_Source: Selina Concise Chemistry Class 10, Ch 7 Metallurgy (Mistral OCR'd PDF), section on aluminium extraction_
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