The general formula of alum is:
- A$M_2SO_4 \cdot M'_2(SO_4)_3 \cdot 24H_2O$
- B$MSO_4 \cdot M'(SO_4)_3 \cdot 14H_2O$
- C$M_2SO_4 \cdot M'(SO_4)_3 \cdot 24H_2O$
- DNone of these
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