Starting raw material for the manufacture of alum is_________________?
Correct answer: C. Bauxite
- A. Alumina
- B. Gypsum
- C. Bauxite
- D. Ammonium bicarbonate
Explanation
Bauxite is the usual aluminium-bearing starting material for alum manufacture; it is digested to obtain alumina, which is then converted into alum. Gypsum is a calcium sulphate mineral and is not the normal raw material for alum.
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