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5. Co-ordination chemistry — Chemistry STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceChemistry5. Co-ordination chemistry1 Mark
MCQ
The most stable ion is
  • A
    $[Fe(C_2O_4)_3]^{3-}$
  • ✓
    $[Fe(CN)_6]^{3-}­$
  • C
    $[Fe(CN)_6]^{4-}$
  • D
    $[Fe(H_2O)_6]^{3+}$
✓

Answer

Correct option: B.
$[Fe(CN)_6]^{3-}­$
b
Among the given complexes the most stable is $\left[ Fe ( CN )_6\right]^{3-}$ because only this complex is forming a inner orbital complex because of the presence of a strong field ligand and its hybridization is $d^2 s p^3$ while rest of the complexes forms a outer orbital complex which are less stable in comparison.

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