2. Arrange the following ions in increasing order of unpaired electrons for low-spin complexes: Mn3+, Cr3+, Fe3+, Co3+.

Question

Shiksha Nation · Accepted Answer

Solution:
 Electronic configurations:
 
 Cr3+ → 3d3 → 3 unpaired electrons
 Mn3+ → 3d4 → 2 unpaired electrons
 Fe3+ → 3d5 → 1 unpaired electron
 Co3+ → 3d6 → 0 unpaired electron
 
 Answer: Co3+ < Fe3+ < Mn3+ < Cr3+

2. Arrange the following ions in increasing order of unpaired electrons for low-spin complexes: Mn³⁺, Cr³⁺, Fe³⁺, Co³⁺.

Verified Answer