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Arrange following complex ions in increasing

Question:

Arrange following complex ions in increasing order of crystal field splitting energy (DO) :

[Cr(Cl)6]3–, [Cr(CN)6]3–, [Cr(NH3)6]3+.

Solution:

The increasing order of crystal field energy is

[Cr(Cl)6]3–<[Cr(NH3)6]3+ <[Cr(CN)6]3–

 

This is also the order of field strength of the ligands according to the spectrochemical series.

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