Alum is commercially produced from___________________?
Correct answer: D. Bauxite
- A. Gypsum
- B. Feldspar
- C. Galena
- D. Bauxite
Explanation
Bauxite is the principal commercial ore of aluminium and supplies the alumina needed for alum manufacture. Gypsum, feldspar and galena are not the usual raw material for this purpose.
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