The metal complex that is diamagnetic is (Atomic number: $Fe = 26, Cu = 29$)

  • A
    $K_{3}[Cu(CN)_{4}]$
  • B
    $K_{2}[Cu(CN)_{4}]$
  • C
    $K_{3}[Fe(CN)_{4}]$
  • D
    $K_{4}[FeCl_{6}]$

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