The spin only magnetic moment of Fe^ 3+ ion (in BM) is approximately.

Correct answer: C. 6 Electronic configuration of Fe. aligned _ 26 Fe & =[Ar] 3 d^6 4 s^2 Fe^ 3+ & =[Ar] 3 d^5 aligned Number of unpaired electrons, n=5 Spin only magnetic moment, μ_s= n(n+2) BM gathered μ_s= 5(5+2) μ_s= 35 μ_s=5.85 BM or μ_s 6 BM gathered

BITSAT 2024

Exam: BITSAT
Year: 2024
Subject: Chemistry
Chapter: Chemical Bonding and Molecular Structure

BITSAT 2024 · Chemistry · Chemical Bonding and Molecular Structure

The spin only magnetic moment of Fe^ 3+ ion (in BM) is...

The spin only magnetic moment of

\mathrm{Fe}^{3+}

ion (in BM) is approximately.

Options

Correct answer

C. 6

Step-by-step solution

Electronic configuration of Fe.

\begin{aligned} { }_{26} \mathrm{Fe} & =[\mathrm{Ar}] 3 d^6 4 s^2 \\ \mathrm{Fe}^{3+} & =[\mathrm{Ar}] 3 d^5 \end{aligned}

Number of unpaired electrons,

n=5

Spin only magnetic moment,

\mu_s=\sqrt{n(n+2)} \mathrm{BM}\begin{gathered} \mu_s=\sqrt{5(5+2)} \\ \mu_s=\sqrt{35} \\ \mu_s=5.85 \mathrm{BM} \text{ or } \mu_s \simeq 6 \mathrm{BM} \end{gathered}

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