On performing a borax-bead test with a given inorganic mixture for qualitative analysis,the colour of the bead was found to be emerald green both in oxidising and reducing flame. It indicates the possibility of the presence of

  • A
    $Co^{2+}$
  • B
    $Ni^{2+}$
  • C
    $Cr^{3+}$
  • D
    $Cu^{2+}$

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