Question

Spin only magnetic moments of a $d^8$ ion in octahedral, square planar, and tetrahedral complexes, respectively, are :

• A. 2.8 B.M., 0, and 2.8 B.M.
• B. 2.8, 2.8, and 2.8 B.M.
• C. 0, 0, and 0 B.M.
• D. None of these

Answer 1

Answer: (A)

2.8 B.M., 0, and 2.8 B.M.

As we know,
Magnetic moment = $\sqrt{n(n+2)}$
In octahedral complex it will have 2 unpaired electron so $\mu =2.8BM$
square planar complex, it will have zero unpaired electron so $\mu =0$
and tetrahedral complex it will have 2 unpaired electron so $\mu =2.8BM$