How is $H_2S$ prepared in the laboratory using $FeS$?

  • A
    $FeSO_4 + H_2SO_4$
  • B
    $FeS +$ dilute $H_2SO_4$
  • C
    $FeS +$ concentrated $H_2SO_4$
  • D
    Elemental $H_2 +$ elemental $S$

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