Which of the following complexes is paramagnetic and an inner orbital complex?

  • A
    $[Fe(CN)_6]^{4-}$
  • B
    $[Cr(NH_3)_6]^{3+}$
  • C
    $[Co(NH_3)_6]^{3+}$
  • D
    $[Fe(NO_2)_6]^{4-}$

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Briefly explain the Valence Bond Theory $(VBT)$.

Total number of $e^-$ in $e_g$ orbitals of $Mn$ for the complex $[MnO_4]^-$ is:

The number of unpaired electrons responsible for the paramagnetic nature of the following complex species are respectively $:$
$[Fe(CN)_6]^{3-}, [FeF_6]^{3-}, [CoF_6]^{3-}, [Mn(CN)_6]^{3-}$

The geometries of some complex ions are given below. Select the correct answer.
$(1) [Ag(NH_3)_2]^+ - \text{Linear}$
$(2) [MnCl_4]^{2-} - \text{Tetrahedral}$
$(3) [Cu(NH_3)_4]^{2+} - \text{Square planar}$
$(4) [Ni(CN)_4]^{2-} - \text{Square planar}$

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An aqueous solution of $NiCl_{2}$ was heated with excess sodium cyanide in the presence of a strong oxidizing agent to form $[Ni(CN)_{6}]^{2-}$. The total change in the number of unpaired electrons on the metal centre is $.....$

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