Spin only magnetic moment value of ${C r}^{3 +}$ ion is:

2.87

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3.87

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3.47

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3.67

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Solution

The correct option is B $3.87$ BM
${C r}^{3 +} = 3 d^{3}$ ;

Hence, $μ = \sqrt{n (n + 2)}$

BM $= \sqrt{3 (3 + 2)} = \sqrt{15} = 3.87$ BM

Hence, option $B$ is correct.

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