alleryCommon ore of aluminium is
AFeldspar, KAlSi3O8 only
BCryolite, Na3AlF6
CCorundum, Al2O3
DBauxite, Al2O3 . 2 H2O
Answer & Solution
Correct answer: D. Bauxite, Al2O3 . 2 H2O
1. The chapter section on ores of aluminium gives the principal ore.
2. Bauxite Al2O3 . 2 H2O is mined for industrial extraction.
3. Cryolite is used as an additive, corundum is a mineral form.
4. So option A is correct.
_Source: Selina Concise Chemistry Class 10, Ch 7 Metallurgy (Mistral OCR'd PDF), section on ores of aluminium_
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