Question

The spin-only magnetic moment value of the ion among \( \text{Ti}^{2+}, \text{V}^{2+}, \text{Co}^{3+}, \text{and} \, \text{Cr}^{2+} \), that acts as a strong oxidizing agent in aqueous solution is:\(\dots\) BM (Nearest integer).
Given atomic numbers: Ti: 22, V: 23, Cr: 24, Co: 27

Answer 1

Correct Answer: 5

Cobalt(III) (\(Co^{3+}\)) is a potent oxidizing agent. The \(Co^{3+}\) ion, with the electron configuration \(3d^6\), possesses 4 unpaired electrons. The spin-only magnetic moment is calculated using the formula: \[ \mu = \sqrt{n(n+2)} \, \text{BM} \]. With \(n = 4\), the magnetic moment is determined as: \[ \mu = \sqrt{4(4+2)} = \sqrt{24} \approx 5 \, \text{BM} \]