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Diamagnetic (u= 0) complexes of cobalt(III) such as [Co(NH3)6]^3+, [Co(en)3]^3+,and [Co(NO2)6]^3- are orange-yellow. In contrast, the...

Diamagnetic (u= 0) complexes of cobalt(III) such as [Co(NH3)6]^3+, [Co(en)3]^3+,and [Co(NO2)6]^3- are orange-yellow. In contrast, the paramagnetic complexes [CoF6]^3- and [Co(H2O)3F3] are blue. Explain Qualitatively this difference in color and magnetic moment.

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