Question

The value of the ‘spin only’ magnetic moment for one of the following configuration is $2.84$BM. The correct one is

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

Answer 1

Answer: (A)

$d^{4}$ (in strong ligand field)

Answer 2

Spin only magnetic moment

$= \sqrt{n(n + 2)}B.M$

Where, n = no. of unpaired electrons.

Given, $\sqrt{n(n + 2)} = 2.84$

Or, n (n + 2 ) $= 8.0656$

Or, n = 2

In an octahedral complex, for a $d^{4}$configuration in a strong filed ligand, number of unpaired electrons = 2