Ncert Exercises & Solutions

Which of the following has the highest spin-only magnetic moment value?

1. ${Ti}^{3 +}$

2. ${Mn}^{2 +}$

3. ${Fe}^{2 +}$

4. ${Co}^{3 +}$

HINT: $μ = \sqrt{n (n + 2)} BM$

Explanation: Ion contains the maximum number of unpaired electrons has high magnetic moment values

Spin magnetic moment is√n(n+2), where n is the number of unpaired electrons.

STEP 1: The configuration of ions are as follows:

${Ti}^{3 +} = [Ar] 3 d^{1}$
$1 unpaired electron$

${Mn}^{2 +} = [Ar] 3 d^{5}$
$5 unpaired electron$

${Fe}^{2 +} = [Ar] 3 d^{6}$
$four unpaired electron$

${Co}^{3 +} = [Ar] 3 d^{6}$
$Four unpaired electron$

STEP 2:

The ${Mn}^{2 +}$ ion contains a maximum number of unpaired electrons, hence, it has a high spin-only magnetic moment value.

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