Select the correct order of $\Delta_o$ (Crystal Field Splitting Energy).

  • A
    $[Co(NH_3)_6]^{3+} > [Rh(NH_3)_6]^{3+} > [Ir(NH_3)_6]^{3+}$
  • B
    $[NiCl_4]^{2-} > [NiCl_6]^{4-}$
  • C
    $[M(H_2O)_6]^{3+} < [M(NO_2)_6]^{3-} < [M(CN)_6]^{3-}$
  • D
    $[M(CN)_6]^{3-} > [M(CN)_6]^{2-}$

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Arrange the following ligands in the order of increasing field strength.
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Which of the following complexes has maximum $CFSE$?

Write down the number of $3d$ electrons in each of the following ions:
$Ti^{2+}, V^{2+}, Cr^{3+}, Mn^{2+}, Fe^{2+}, Fe^{3+}, Co^{2+}, Ni^{2+}$ and $Cu^{2+}$
Indicate how you would expect the five $3d$ orbitals to be occupied for these hydrated ions (octahedral).

Difficult
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The complex ion having minimum magnitude of $\Delta_{0}$ $(CFSE)$ is

Absorbed colour of the solutions of the following complexes $[M(NH_3)_6]^{2+}$,$[M(H_2O)_6]^{2+}$ and $[MCl_4]^{2-}$ are respectively (having the same metal ion):

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