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Which of the following have similar magnetic moment: Fe, Fe^2+ and Fe^3+?

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Which of the following have similar magnetic moment: Fe, Fe^2+ and Fe^3+?

(a) Fe and Fe^2+

(b) Fe and Fe^3+

(c) Fe^3+ and Fe^2+

(d) Fe, Fe^3+ and Fe^2+

The question was asked in an internship interview.

I need to ask this question from Zeeman Effect in portion Quantum Physics of Engineering Physics I

1 Answer

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Right answer is (a) Fe and Fe^2+

The explanation: Both Fe and Fe^2+ have four unpaired electrons while Fe^3+ have five unpaired electrons. Thus, Fe and Fe^2+ have same magnetic moment.

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