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Consider the following metal complexes :  [Co(NH3)]^3+ [CoCl(NH3)5]^2+ [Co(CN)6]^3– [Co(NH3)5(H2O)]^3+ 

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Consider the following metal complexes : 

[Co(NH3)]3+

[CoCl(NH3)5]2+

[Co(CN)6]3–

[Co(NH3)5(H2O)]3+ 

The spin-only magnetic moment value of the complex that absorbs light with shortest wavelength is B.M. (Nearest integer)

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\(\Delta_0 \propto \frac1\lambda\)

Here, CN– being SFL will have maximum CFSE 

So, [Co(CN)6]3– will be d2 sp3, µ = 0

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