How is $H_2S$ liberated in the laboratory?

  • A
    $FeSO_4 + H_2SO_4$
  • B
    $FeS + \text{dil. } H_2SO_4$
  • C
    $FeS + \text{conc. } H_2SO_4$
  • D
    Elementary $H_2 + \text{elementary } S$

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