Single Choice

The correct order of spin-only magnetic moments among the following is: (Atomic number: $$Mn=25, Co=27, Ni=28, Zn=30)$$.

A$$[ZnCl_4]^{2-} > [NiCl_4]^{2-} > [CoCl_4]^{2-} > [MnCl_4]^{2-}$$
B$$[CoCl_4]^{2-} > [MnCl_4]^{2-} > [NiCl_4]^{2-} > [ZnCl_4]^{2-}$$
C$$[NiCl_4]^{2-} > [CoCl_4]^{2-} > [MnCl_4]^{2-} > [ZnCl_4]^{2-}$$
D$$[MnCl_4]^{2-} > [CoCl_4]^{2-} > [NiCl_4]^{2-} > [ZnCl_4]^{2-}$$
Correct Answer

Solution

The complex having higher number of unpaired electrons will have higher value of spin-only magnetic moment.

The correct order of spin-only magnetic moments is $$[MnCl_4]^{2-} > [CoCl_4]^{2-} > [NiCl_4]^{2-} > [ZnCl_4]^{2-}$$.

In these complexes, the central metal ion is in $$\displaystyle +2$$ oxidation state.

$$\displaystyle Zn^{2+}$$ has $$\displaystyle 3d^{10}$$ outer electronic configuration with $$\displaystyle 0$$ unpaired electrons.

$$\displaystyle Ni^{2+}$$ has $$\displaystyle 3d^{8}$$ outer electronic configuration with $$\displaystyle 2$$ unpaired electrons.

$$\displaystyle Co^{2+}$$ has $$\displaystyle 3d^{7}$$ outer electronic configuration with $$\displaystyle 3$$ unpaired electrons.

$$\displaystyle Mn^{2+}$$ has $$\displaystyle 3d^{5}$$ outer electronic configuration with $$\displaystyle 5$$ unpaired electrons.

Hence, the correct option is D.

SIMILAR QUESTIONS

d - block and f - block Elements

Select the correct order with respect to paramagnetic property of the ions.

d - block and f - block Elements

The magnetic moment of $$[Cu(NH_{3})_{4}]^{2+}$$ was found to be 1.73 B.M. The number of unpaired electrons in the complex is:

d - block and f - block Elements

Which of the following ions having the following electronic structure would have a maximum magnetic moment?

d - block and f - block Elements

Titanium shows the magnetic moment of 1.73 B.M. in its compound. What is the oxidation number of $$Ti$$ in the compound?

d - block and f - block Elements

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d - block and f - block Elements

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d - block and f - block Elements

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d - block and f - block Elements

The INCORRECT statement is:

d - block and f - block Elements

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d - block and f - block Elements

Which of the following has the highest paramagnetism?

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