The only cations present in a slightly acidic solutions are $Fe^{3+},\,Zn^{2+}$ and $Cu^{2+}$. The reagent that when added in excess to this solution would identify and separate $Fe^{3+}$ in one step is

  • [AIIMS 2010]
  • A

    $2\,M\,HCl$

  • B

    $6\,M\,NH_3$

  • C

    $6\,M\,NaOH$

  • D

    $H_2S$ gas

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  • [AIIMS 2007]