MEDIUMMCQ SINGLEJEE Mains ChemistryInorganic ChemistryCoordination compoundsValence Bond Theory

Which one of the following complex ion has the highest magnetic moment?

A.[Cr(NH3)6]3+✓ Correct

B.[Fe(CN)6]3–

C.[Fe(CN)6]4–

D.[Zn(NH3)6]2+

Explanation

Magnetic moment increases with the increase in the number of unpaired electron. In +3 3 6 [Cr(NH ) ] Cr is present in +3 oxidation state and will have 3 unpaired electrons. In 3- 6 [Fe(CN) ] one unpaired electron is present and in 4- +2 6 3 6 [Fe(CN) ] &[Zn(NH ) ] unpaired electrons is absent. Therefore +3 3 6 [Cr(NH ) ] has the highest magnetic moment. Hence, the correct option is (a).

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