Which of the following sets is not isoelectronic?

  • A
    $BO_3^{3-}, NO_3^-, CO_3^{2-}$
  • B
    $SO_3^{2-}, CO_3^{2-}, NO_3^-$
  • C
    $CN^-, N_2, C_2^{2-}$
  • D
    $PO_4^{3-}, SO_4^{2-}, ClO_4^-$

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