Question

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

• A. d4 (in strong field ligand)
• B. d4 (in weak field ligand)
• C. d3 (in weak as well as strong field ligand)
• D. d5 (in strong field ligand)

Answer 1

Answer: (A)

d4 (in strong field ligand)

Answer 2

3d4

Sol. CN– is strong field ligand ; so it compels for pairing of electrons to have two d-orbital empty.

m = $\sqrt{n(n + 2)} = \sqrt{2(2 + 2)}$= 2.84 B.M