MEDIUMMCQ SINGLEIChO (Chemistry Olympiad)Inorganic ChemistryCoordination compoundsValence Bond Theory

Among the following complexes, which has a magnetic moment 5.9 BM ? Ni(CO)4, [Fe(H2O)6]2+, [Co(NH3)6]3+, [MnBr4]2–, [Zn(NH3)4]2+

A.Ni(CO)4

B.[Fe(H2O)6]2+

C.[Co(NH3)6]3+

D.[MnBr4]2–✓ Correct

Explanation

For having a Magnetic moment of 5.9BM the number of unpaired electrons will be- COORDINATION COMPOUNDS 14 n(n+2) 5.9= n(n+2) n=5 In the complex- 2- 4 [MnBr ] the oxidation state of Mn is +2 and has an electronic configuration of- 5 0 3d ,4s And as Br is a weak field ligand the number of unpaired electrons is 5. Hence, it will have a magnetic moment of 5.9BM. Hence, option (d) is the correct answer

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