Green vitriol is . . . .

  • A
    $CuSO_4 \cdot 5H_2O$
  • B
    $FeSO_4 \cdot 7H_2O$
  • C
    $CaSO_4 \cdot 2H_2O$
  • D
    $ZnSO_4 \cdot 7H_2O$

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