Observe the following complex ions:
Complex IonLabel
$[Mn(CN)_6]^{3-}$$A$
$[Fe(CN)_6]^{3-}$$B$
$[CoF_6]^{3-}$$C$
$[Co(C_2O_4)_3]^{3-}$$D$

Identify the option in which the unpaired electrons in the complex ions are in correct increasing order.

  • A
    $C < A < B < D$
  • B
    $B < A < C < D$
  • C
    $D < A < B < C$
  • D
    $D < B < A < C$

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