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  • Which metal have the higher crystal field splitting (), other factors remaining same?<

Which metal have the higher crystal field splitting (\Delta), other factors remaining same?

Option: 1

Co(I)


Option: 2

Co(II)


Option: 3

Co(III)


Option: 4

Co(V)


Answers (1)

As we have learnt,

Factors Affecting CFSE -

  1. Nature of central metal atom: As we move down the group, the CFSE increases. From 3d to 4d, there is a 30% increase in CFSE and from 4d to 5d, there is a 50% increase in CFSE.
  2. Oxidation state of central metal atom: Oxidation state is directly proportional to CFSE.
    The CFSE of [Fe(CN)6]3- is greater than [Fe(CN)6]4-.
  3. Nature of ligand: In case of strong field ligand, magnitude of CFSE is high. In case of weak field ligand, magnitude of CFSE is low.
  4. Nature of complex: In octahedral complex, 6 ligands approach the central metal atom and thus repulsion is higher, due to which the CFSE is higher. But, in tetrahedral complex, 4 ligands approach the central metal atom and thus repulsion is lower and thus the CFSE is lower.

-

The higher the Oxidation State of the metal, the greater the crystal field splitting.

Therefore, option (4) is correct.

Posted by

Ramraj Saini

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