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

Question

Among the following complexes, which has a magnetic moment 5.9 BM ? Ni(CO)4, [Fe($H_2O$)6]2+, [Co($NH_3$)6]3+, [$MnBr_4$]2–, [Zn($NH_3$)4]2+

Prashant Kotian · Accepted Answer

Correct answer: D. 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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