Chemistry › Coordination Compounds › Werner's theory and Valence Bond Theory
Which one of the following complexes will exhibit the least paramagnetic behaviour? [Atomic number,…
Which one of the following complexes will exhibit the least paramagnetic behaviour?
[Atomic number, \(\mathrm{Cr}=24, \mathrm{Mn}=25, \mathrm{Fe}=26, \mathrm{Co}=27\) ]
\(\left[\mathrm{Cr}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+}\) \(\left[\mathrm{Fe}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+}\) \(\left[\mathrm{Co}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+}\) \(\left[\mathrm{Mn}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+}\) Solution
$\begin{array}{|l|l|l|}
\hline & \begin{array}{l}
\text{Number of unpaired e}
\end{array} & \mu=\sqrt{\mathrm{n}(\mathrm{n}+2)} B.M. \\
\hline\left[\mathrm{Co}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+} & 3 & 3.87 \\
\hline\left[\mathrm{Fe}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+} & 4 & 4.89 \\
\hline\left[\mathrm{Mn}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+} & 5 & 5.92 \\
\hline\left[\mathrm{Cr}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+} & 4 & 4.89 \\
\hline
\end{array}$
Least paramagnetic behaviour $=\left[\mathrm{Co}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+}$
Asked in: JEE Main 2024 (05 Apr Shift 1)
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