QJEEM24Ch9da3: JEE Main 2024 Chemistry - Class 12 JEEM24Ch9da3 Solution: Select the option with correct property -

Question

Verified Solution • 2025–26 Session moderate

Select the option with correct property -

A $\left[\mathrm{Ni}(\mathrm{CO})_4\right]$ and $\left[\mathrm{NiCl}_4\right]^{2-}$ both Paramagnetic
B $\left[\mathrm{Ni}(\mathrm{CO})_4\right]$ and $\left[\mathrm{NiCl}_4\right]^{2-}$ both Diamagnetic
C $\left[\mathrm{NiCl}_4\right]^{2-}$ Diamagnetic, $\left[\mathrm{Ni}(\mathrm{CO})_4\right]$ Paramagnetic
D $\left[\mathrm{Ni}(\mathrm{CO})_4\right]$ Diamagnetic, $\left[\mathrm{NiCl}_4\right]^{2-}$ Paramagnetic

Accepted Answer

$\left[\mathrm{Ni}(\mathrm{CO})_4\right] \rightarrow$ 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 $=2$

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