Question

The value of "spin only" magnetic moment for one of the following configuration is 2.84 B.M. The correct one is:

• A. $d^4$ (in strong field ligand)
• B. $d^2$ (in weak field ligand)
• C. $d^3$ (in weak as well as in strong field ligand)
• D. $d^5$ (in strong field ligand)

Answer 1

Answer: (A), (B)

$d^4$ (in strong field ligand)
$d^2$ (in weak field ligand)

As we know,
Magnetic moment = $\sqrt{n(n+2)}=\mathrm{2.84.}$
so n=2 and it have 2 unpaired electron so $d^2$ configuration (in weak field ligand).

In $d^4$ in strong field ligand also 2 unpaire electron.