Consider the following low-spin complexes $\mathrm{K}_3\left[\mathrm{Co}\left(\mathrm{NO}_2 ight)_6 ight], \mathrm{K}_4\left[\mathrm{Fe}(\mathrm{CN})_6 ight]$, $\mathrm{K}_3\left[\mathrm{Fe}(\mathrm{CN})_6 ight], \mathrm{Cu} u_2\left[\mathrm{Fe}(\mathrm{CN})_6 ight] ext { and }…

Question

Consider the following low-spin complexes
$\mathrm{K}_3\left[\mathrm{Co}\left(\mathrm{NO}_2\right)_6\right], \mathrm{K}_4\left[\mathrm{Fe}(\mathrm{CN})_6\right]$,
$\mathrm{K}_3\left[\mathrm{Fe}(\mathrm{CN})_6\right], \mathrm{Cu} u_2\left[\mathrm{Fe}(\mathrm{CN})_6\right] \text { and } \mathrm{Zn}_2\left[\mathrm{Fe}(\mathrm{CN})_6\right]$
The sum of the spin-only magnetic moment values of complexes having yellow colour is. _____ B.M. (answer in nearest integer)

Aicharya · Accepted Answer

$\mathrm{K}_3\left[\mathrm{Co}\left(\mathrm{NO}_2\right)_6\right]=$ Yellow $\Rightarrow \mathrm{Co}^{3+}=3 \mathrm{~d}^6 \Rightarrow \mathrm{t}_{2 \mathrm{~g}}^6 \mathrm{e}_{\mathrm{g}}^0$
$\begin{aligned}
& \mathrm{K}_4\left[\mathrm{Fe}(\mathrm{CN})_6\right]=\text { Yellow } \Rightarrow \mathrm{Fe}^{2+}=3 \mathrm{~d}^6 \Rightarrow \mathrm{t}_{2 \mathrm{~g}}^6 \mathrm{e}_{\mathrm{g}}^0 \\
& \mathrm{~K}_3\left[\mathrm{Fe}(\mathrm{CN})_6\right]=\text { Bright Red } \Rightarrow \mathrm{Fe}^{3+}=3 \mathrm{~d}^5 \Rightarrow \mathrm{t}_{2 \mathrm{~g}}^5 \mathrm{e}_{\mathrm{g}}^0 \\
& \mathrm{Cu}_2\left[\mathrm{Fe}(\mathrm{CN})_6\right]=\text { Chocolate brown } \\
& \mathrm{Zn}_2\left[\mathrm{Fe}(\mathrm{CN})_6\right]=\text { White }
\end{aligned}$
Spin only magnetic moment of complex having Yellow colour is zero.

Consider the following low-spin complexes $\mathrm{K}_3\left[\mathrm{Co}\left(\mathrm{NO}_2\right)_6\right],…

Solution