For which of the following d^n configuration of octahedral complexes, can not exist in both high spin and low spin forms :
(I) d^3
(II) d^5
(III) d^6
(IV) d^8

Question

Prashant Kotian · Accepted Answer

Correct answer: C. Step 1: Identify the oxidation state and configuration of the central metal in each complex ion: (a) Co^2+ is 3d^7, (b) Cr^3+ is 3d^3, (c) Fe^2+ is 3d^6, (d) Fe^3+ is 3d^5. Step 2: In [FeCl4]^2-, the central Fe^2+ (3d^6) ion is in a tetrahedral crystal field with weak-field Cl^- ligands, giving an e^3 t_2^3 configuration. Step 3: This configuration results in exactly 4 unpaired electrons. Thus, [FeCl4]^2- is the correct choice.

💡 Solution & Explanation

Practice 22,000+ questions like this