MCQ
Purification of alumina takes place by $........$
- ABosch process.
- ✓Hall's process.
- CHoope's process.
- DQuartation process.
✓
Answer
Correct option: B.
Hall's process.
Purification of alumina takes place by Hall's process. It involves fusion of bauxite with sodium carbonate in presence of little lime when alumina dissolves as sodium$-$meta$-$aluminate. Extraction of the fused mass with water followed by the extraction removes impurities.
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