Common alum is
- A$K_2SO_4 \cdot Al_2(SO_4)_3 \cdot 24H_2O$
- B$K_2SO_4 \cdot Cr_2(SO_4)_3 \cdot 24H_2O$
- C$K_2SO_4 \cdot Fe_2(SO_4)_3 \cdot 24H_2O$
- D$(NH_4)_2SO_4 \cdot FeSO_4 \cdot 6H_2O$
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