Question

The value of the "spin only" magnetic moment for one of the following configurations is 2.84 BM. The correct one is :

• A. $d^5$ (in strong ligand field)
• B. $d^3$ (in weak as well as in strong fields)
• C. $d^4$ (in weak ligand field)
• D. $d^4$ (in strong ligand field)

Answer 1

Answer: (D)

$d^4$ (in strong ligand field)

Answer 2

(a) $d^5$ in strong field n = unpaired electron = 1 Magnetic moment $= \sqrt{n\left(n + 2\right)}BM$ $= \sqrt{3} BM = 1.73 \,BM$ $\left(b\right) d^{3}$ in strong/weak field $n = 3$ Magnetic moment $= \sqrt{15} = 3.87\,BM$ $\left(c\right) d^{4}$ in weak field $n = 4$ Magnetic moment $=\sqrt{24} = 4.90\,BM$ $\left(d\right) d^{4 }$ in strong field $n = 2$ Magnetic moment $=\sqrt{8} = 2.83 \,BM$