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A:- Spin only Magnetic moment of $F e^{+ 3}$ ion is 5.92 B.M
R:- Number of unpaired electrons $F e^{+ 3}$ in ion is 4

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Assertion and reason both are correct and reason is correct explaination of assertion

Assertion is correct but reason is incorrect

But Assertion and reason are correct but reason is not correct explaination for assertion

Assertion is incorrect but reason is correct

answer is A.

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Detailed Solution

$\begin{array}{l} F e^{+ 3} .........3 d^{5} 4 s^{0} \\ n=5 \\ μ = \sqrt{n (n + 2)} B M \end{array}$

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