The d-electron configurations of Cr²⁺, Mn²⁺, Fe²⁺ and Co²⁺ are d⁴, d⁵, d⁶ and d⁷ respectively. Which one of the following will exhibit minimum paramagnetic behaviour? (At. nos. Cr = 24, Mn = 25, Fe = 26, Co = 27)

Question

Dr. Abubacker · Accepted Answer

[Solution from source] H₂O is a weak-field ligand, so all are high-spin: d⁴ (Cr²⁺) has 4 unpaired electrons, d⁵ (Mn²⁺) 5, d⁶ (Fe²⁺) 4 and d⁷ (Co²⁺) 3. Fewest unpaired electrons means least paramagnetism, so the cobalt complex. The manganese complex is the most paramagnetic. Answer (4).

Q. The d-electron configurations of Cr²⁺, Mn²⁺, Fe²⁺ and Co²⁺ are d⁴, d⁵, d⁶ and d⁷ respectively. Which one of the following will exhibit minimum paramagnetic behaviour? (At. nos. Cr = 24, Mn = 25, Fe = 26, Co = 27)

Explanation

Reviewed by Dr. Abubacker

Want to attempt the full paper?