What will be the theoretical value of spin only magnetic moment when $F e (S C N)_{3}$ reacts with a solution containing $F^{-}$ ions to yield a complex?

2.83 B.M.

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3.87 B.M.

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5.92 B.M.

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1.73 B.M.

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Solution

The correct option is A 5.92 B.M.
$F e (S C N)_{3} + 3 F^{-} ⟶ F e F_{3} + 3 S C N^{-}$
Magnetic moment $= μ = \sqrt{n + (n + 2)} = \sqrt{5 \times 7} = \sqrt{35} = 5.92$ BM.

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