JEE MAIN - Chemistry (2023 - 25th January Morning Shift - No. 21)
The number of paramagnetic species from the following is _____________.
$$\mathrm{{[Ni{(CN)_4}]^{2 - }},[Ni{(CO)_4}],{[NiC{l_4}]^{2 - }}}$$
$$\mathrm{{[Fe{(CN)_6}]^{4 - }},{[Cu{(N{H_3})_4}]^{2 + }}}$$
$$\mathrm{{[Fe{(CN)_6}]^{3 - }}\,and\,{[Fe{({H_2}O)_6}]^{2 + }}}$$
Answer
4
Explanation
$$
\begin{array}{ll}
\text { Species } & \text { Magnetic property } \\\\
{\left[\mathrm{Ni}(\mathrm{CN})_4\right]^{2-}} & \text { Diamagnetic } \\\\
{\left[\mathrm{Ni}(\mathrm{CO})_4\right]} & \text { Diamagnetic } \\\\
\left.[\mathrm{NiCl}]_4\right]^{2-} & \text { Paramagnetic } \\\\
\left.[\mathrm{FeCN})_6\right]^{4-} & \text { Diamagnetic } \\\\
{\left[\mathrm{Fe}(\mathrm{CN})_6\right]^{3-}} & \text { Paramagnetic } \\\\
\left.\mathrm{Fe}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+} & \text { Paramagnetic } \\\\
{\left[\mathrm{Cu}\left(\mathrm{NH}_3\right)_4\right]^{2+}} & \text { Paramagnetic }
\end{array}
$$
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