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

CBSE BoardEnglish MediumSTD 12 ScienceChemistry5. Co-ordination chemistry1 Mark
MCQ
Crystal field stabilization energy for high spin $d^4$ octahedral complex is
  • A
    $- 1.8 \Delta _o$
  • B
    $- 1.6 \Delta _o + P$
  • C
    $- 1.2 \Delta _o$
  • ✓
    $- 0.6 \Delta _o$
✓

Answer

Correct option: D.
$- 0.6 \Delta _o$
d
Key ldea In case of high spin complex, $\Delta_{0}$ is small. Thus, the energy required to pair up the fourth electron with the

electrons of lower energy d-orbitals would be higher than that required to place the electrons in the higher d-orbital.

Thus, pairing does not occur.

For high spin $d^{4}$ octahedral complex Crystal fleld stabilisation energy

$=(-3 \times 0.4+1 \times 0.6) \Delta_{0}$

$=(-1.2+0.6) \Delta_{0}=-0.6 \Delta_{0}$

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