Among the following, the compound that is both paramagnetic and coloured is

Among the following, the compound that is both paramagnetic and coloured is
  1. $\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7$
  2. $\left(\mathrm{NH}_4\right)_2\left[\mathrm{TiCl}_6\right]$
  3. $\mathrm{VOSO}_4$
  4. $\mathrm{K}_3\left[\mathrm{Cu}(\mathrm{CN})_4\right]$

Solution

$\begin{aligned} & \mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7 \rightarrow \mathrm{Cr}^{+6}: 3 d^0 \\ & \left(\mathrm{NH}_4\right)_2\left[\mathrm{TiCl}_6\right] \rightarrow \mathrm{Ti}^{+4}: 3 d^0 \\ & \mathrm{VOSO}_4 \rightarrow \mathrm{V}^{+4}: 3 d^1 \\ & \mathrm{~K}_3\left[\mathrm{Cu}(\mathrm{CN})_4\right] \rightarrow \mathrm{Cu}^{+}: 3 d^{10}\end{aligned}$ $\mathrm{VOSO}_4$, due to the presence of one unpaired electron, is paramagnetic and coloured.

Asked in: NEET 2023 (Manipur)

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