Question

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

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 $=2$