Which of the following pairs involves isoelectronic ions?

  • A
    $Mn^{3+}$ and $Fe^{2+}$
  • B
    $Mn^{2+}$ and $Fe^{3+}$
  • C
    $Cr^{3+}$ and $Fe^{2+}$
  • D
    $Fe^{2+}$ and $Co^{2+}$

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