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
    $M_2SO_4 \cdot M'(SO_4)_3 \cdot 24H_2O$
  • D
    None of these

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