The descending order of Δo for the following complexes will be: [Co(H2O)6]3+(I)[Co(H2O)2(CN)4]−(II)[Co(H2O)4(CN)2]+(III)
A
I>II>III
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B
II>I>III
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C
III>II>I
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D
II>III>I
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Solution
The correct option is DII>III>I The value of Δo for mixed ligands depends on the additive contribution of ligand strengths. The number of CN− (a strong ligand) is maximum (4) in [Co(H2O)2(CN)4]− and minimum (0) in [Co(H2O)6]3+.