The molecular formula of potash alum is

  • A
    $KAl_2(SO_4)_2 \cdot 12H_2O$
  • B
    $K_2SO_4 \cdot Al_2(SO_4)_3 \cdot 24H_2O$
  • C
    $K_2Al_2(SO_4)_4 \cdot 24H_2O$
  • D
    $KAl(SO_4)_2 \cdot 24H_2O$

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