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Question

A$\left[\mathrm{Ni}(\mathrm{CO})_4\right]$ અને $\left[\mathrm{NiCl}_4\right]^{2-}$ પ્રતિચુંબકીય છે
B$\left[\mathrm{Ni}(\mathrm{CO})_4\right]$ અને $\left[\mathrm{NiCl}_4\right]^{2-}$ બંને અનુચુંબકીય છે.
C$\left[\mathrm{NiCl}_4\right]^{2-}$ પ્રતિચુંબકીય, $\left[\mathrm{Ni}(\mathrm{CO})_4\right]$ અનુચુંબકીય છે.
D $\left[\mathrm{Ni}(\mathrm{CO})_4\right]$ પ્રતિચુંબકીય, $\left[\mathrm{NiCl}_4\right]^{2-}$ અનુચુંબકીય છે.

JEE MAIN 2024, Diffcult

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Solution

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 $=2$

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