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Chemistry · Coordination Compounds

JEE Main 2025 — 4 April, Morning Shift — Question 11

Which one of the following complexes will have Δo=0\Delta_{o}=0 and μ=5.96\mu=5.96 B.M?

  1. Option A:

    [Fe(CN)6]4−\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]^{4-}

  2. Option B:

    [Mn(SCN)6]4−\left[\mathrm{Mn}(\mathrm{SCN})_{6}\right]^{4-}

    Correct
  3. Option C:

    [FeF6]4−\left[\mathrm{FeF}_{6}\right]^{4-}

  4. Option D:

    [Co(NH3)6]3+\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+}

Answer: B

Step-by-step solution

Complex having d5d^{5} electronic configuration, with weak field ligand,

has CFSE =0=0.

[Mn(SCN)6]4−⇒Mn2+⇒t2 g3eg2\left[\mathrm{Mn}(\mathrm{SCN})_{6}\right]^{4-} \Rightarrow \mathrm{Mn}^{2+} \Rightarrow \mathrm{t}_{2 \mathrm{~g}}^{3} \mathrm{e}_{\mathrm{g}}^{2}

CFSE =[3×(−0.4)+2×(0.6)]Δ0=[3 \times(-0.4)+2 \times(0.6)] \Delta_{0}

\mathrm{Mn}^{2+}=$$\Rightarrow d^{5}

n=5\mathrm{n}=5

μ=5(5+2)=5×7=5.96BM\mu=\sqrt{5(5+2)}=\sqrt{5 \times 7}=5.96 \mathrm{BM}

Answer key and solution verified before publishing.

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Exam
JEE Main 2025
Paper
4 April, Morning Shift
Subject
Chemistry
Chapter
Coordination Compounds
Topic
Properties and importance of Coordination Complexes

More Coordination Compounds questions from this paper

Which one of the following complexes will have Δ o =0 and μ=5.96 B.M? | JEE Main 2025 PYQ with Solution · DhiX AI