The formula of alum is

  • A
    $K_2SO_4 \cdot Al_2(SO_4)_3 \cdot 24H_2O$
  • B
    $K_4[Fe(CN)_6]$
  • C
    $K_2SO_4 \cdot Al_2(SO_4)_3 \cdot 6H_2O$
  • D
    $Na_2CO_3 \cdot 10H_2O$

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