Question

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

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

Answer 1

The correct option is A $d^4\text{(in strong ligand field)}$

As we know,
$\text{Magnetic moment}=\sqrt{n(n+2)}=2.84$
so n = 2
$d^4\text{(in strong ligand field)}$ has two unpaired electron in octahedral field. Hence, option (a) is correct.

All others doesnt have two unpaired electrons.