The number of paramagnetic complexes among $\left[\mathrm{FeF}_6\right]^{3-},\left[\mathrm{Fe}(\mathrm{CN})_6\right]^{3-},\left[\mathrm{Mn}(\mathrm{CN})_6\right]^{3-}$, $\left[\mathrm{Co}\left(\mathrm{C}_2 \mathrm{O}_4\right)_3\right]^{3-},\left[\mathrm{MnCl}_6\right]^{3-}$, and $\left[\mathrm{CoF}_6\right]^{3-}$, which involved $\mathrm{d}^2 \mathrm{sp}^3$ hybridization is _________.
Answer (integer)
2
Solution
<p>$$\begin{array}{lll}
{\left[\mathrm{FeF}_6\right]^{3-}} & \text { Paramagnetic } & \mathrm{sp}^3 \mathrm{~d}^2 \\
{\left[\mathrm{Fe}(\mathrm{CN})_6\right]^{3-}} & \text { Paramagnetic } & \mathrm{d}^2 \mathrm{sp}^3 \\
{\left[\mathrm{Mn}(\mathrm{CN})_6\right]^{3-}} & \text { Paramagnetic } & \mathrm{d}^2 \mathrm{sp}^3 \\
{\left[\mathrm{Co}\left(\mathrm{C}_2 \mathrm{O}_4\right)_3\right]^{3-}} & \text { Diamagnetic } & \mathrm{d}^2 \mathrm{sp}^3 \\
{\left[\mathrm{MnCl}_6\right]^{3-}} & \text { Paramagnetic } & \mathrm{sp}^3 \mathrm{~d}^2 \\
{\left[\mathrm{CoF}_6\right]^{3-}} & \text { Paramagnetic } & \mathrm{sp}^3 \mathrm{~d}^2
\end{array}$$</p>
<p>Only $\left[\mathrm{Fe}(\mathrm{CN})_6\right]^{3-}$ and $\left[\mathrm{Mn}(\mathrm{CN})_6\right]^{3-}$ are paramagnetic and $\mathrm{d}^2 \mathrm{sp}^3$ hybridisation of metal.</p>
About this question
Subject: Chemistry · Chapter: Coordination Compounds · Topic: Ligands and Coordination Number
This question is part of PrepWiser's free JEE Main question bank. 173 more solved questions on Coordination Compounds are available — start with the harder ones if your accuracy is >70%.