Question

Spin-only magnetic moment of $\left[Co\right(N{H}_3{)}_3\left(H_{2}O{)}_3\right]C{l}_3$ (in BM) is :

• A. Zero
• B. $\sqrt{3}$
• C. $\sqrt{24}$
• D. $\sqrt{35}$

Answer 1

The correct option is A Zero

Oxidation state of Co is +3 in the complex
Electronic configuration of $C{r}^{+3}$ is $\left[Ar\right]3d^6,C{o}^{3+}$ is nearly always low-spin. It forms $d^{2}s{p}^3$ hybridisation and contains zero unpaired electrons.
Hence,
Also, $\mu =\sqrt{n(n+2)}=0$