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

CBSE BoardEnglish MediumSTD 12 ScienceChemistry5. Co-ordination chemistry1 Mark
MCQ
$[Fe(CN)_6]^{4-}$ and $[Fe(H_2O)_6]^{2+}$ show different colours in dilute solution because
  • ✓
    $CN^-$ is a strong field ligand and $H_2O$ is a weak ligand hence magnitude of $CFSE$ is different
  • B
    both $CN^-$ and $H_2O$ absorb same wavelength of energy
  • C
    complexes of weak field ligands are generally colourless
  • D
    the sizes of $CN^-$ and $H_2O$ are different hence their colours are also different.
✓

Answer

Correct option: A.
$CN^-$ is a strong field ligand and $H_2O$ is a weak ligand hence magnitude of $CFSE$ is different
a
Due to strong field ligand $CFSE$ increases

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