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What is the ratio of the magnetic moments of Fe(III) and Co(II)?

1. √7: √3
2. 3: 7
3. √3: √7
4. 3: √7

Correct answer: √7: √3

Solution

The magnetic moment is determined by the number of unpaired electrons in the d-orbitals of the transition metals. Fe(III) has 5 unpaired electrons, leading to a magnetic moment of √35, while Co(II) has 4 unpaired electrons, resulting in a magnetic moment of √24. The ratio of their magnetic moments simplifies to √7: √3.

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