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JEE Main 202529 JanuaryEvening Shift
Exam
JEE Main
Year
2025
Date
29 January
Shift
Evening Shift
Subject
Chemistry
Chapter
Coordination Compounds

JEE Main 2025 · 29 January · Evening Shift · Chemistry · Coordination Compounds

Identify the homoleptic complexes with odd number of d electrons in...

Identify the homoleptic complexes with odd number of d electrons in the central metal : (A) [FeO4]2−\left[\mathrm{FeO}_4\right]^{2-} (B) [Fe(CN)6]3−\left[\mathrm{Fe}(\mathrm{CN})_6\right]^{3-} (C) [Fe(CN)5NO]2−\left[\mathrm{Fe}(\mathrm{CN})_5 \mathrm{NO}\right]^{2-} (D) [CoCl4]2−\left[\mathrm{CoCl}_4\right]^{2-} (E) \left[\mathrm{Co}\left(\mathrm{H}_2 \mathrm{O}\right)_3 \mathrm{~F}_3\right] Choose the correct answer from the options given below :

Options

  1. A(A), (B) and (D) only
  2. B(C) and (E) only
  3. C(B) and (D) only
  4. D(A), (C) and (E) only

Correct answer

C. (B) and (D) only

Step-by-step solution

(A) [FeO4]2−⇒Fe6+=3 d2\left[\mathrm{FeO}_4\right]^{2-} \Rightarrow \mathrm{Fe}^{6+}=3 \mathrm{~d}^2 (B) [Fe(CN)8]3−⇒Fe3+=3 d5\left[\mathrm{Fe}(\mathrm{CN})_8\right]^{3-} \Rightarrow \mathrm{Fe}^{3+}=3 \mathrm{~d}^5 (C) [Fe(CN)5NO]2−⇒Fe2+=3 d6\left[\mathrm{Fe}(\mathrm{CN})_5 \mathrm{NO}\right]^{2-} \Rightarrow \mathrm{Fe}^{2+}=3 \mathrm{~d}^6 (D) [CoCl4]2−⇒Co2+=3 d7[\mathrm{CoCl} 4]^{2-} \Rightarrow \mathrm{Co}^{2+}=3 \mathrm{~d}^7 (E) [Co(H2O)3 F3]⇒Co3+=3 d6\left[\mathrm{Co}\left(\mathrm{H}_2 \mathrm{O}\right)_3 \mathrm{~F}_3\right] \Rightarrow \mathrm{Co}^{3+}=3 \mathrm{~d}^6 (B) and (D) are homoleptic complex having odd no. of d electrons.
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