Chemistry · Coordination Compounds

JEE Main 2024 — 31 January, Shift 2 — Question 61

Select the option with correct property -

Option A:
$\left[\mathrm{Ni}(\mathrm{CO})_{4}\right]$ and $\left[\mathrm{NiCl}_{4}\right]^{2-}$ both diamagnetic
Option B:
$\left[\mathrm{Ni}(\mathrm{CO})_{4}\right]$ and $\left[\mathrm{NiCl}_{4}\right]^{2-}$ both paramagnetic
Option C:
$\left[\mathrm{NiCl}_{4}\right]^{2-}$ diamagnetic, $\left[\mathrm{Ni}(\mathrm{CO})_{4}\right]$ paramagnetic
Option D:
$\left[\mathrm{Ni}(\mathrm{CO})_{4}\right]$ diamagnetic, $\left[\mathrm{NiCl}_{4}\right]^{2-}$ paramagnetic
Correct

Answer: D

$\left[\mathrm{Ni}(\mathrm{CO})_{4}\right] \rightarrow$ diamagnetic, $\mathrm{sp}^{3}$ hybridisation, number of unpaired electrons $=0$

$\left[\mathrm{NiCl}_{4}\right]^{2-}, \rightarrow$ paramagnetic, $\mathrm{sp}^{3}$ hybridisation, number of unpaired electrons $=2$

Answer key and solution verified before publishing.

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