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JEE Main 28-Jan-2025 Paper - Shift 2 — JEE STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceJEEJEE Main 28-Jan-2025 Paper - Shift 24 Marks
Question
Total number of molecules/species from following which will be paramagnetic is _______________ .
$\mathrm{O}_{2}, \mathrm{O}_{2}^{+}, \mathrm{O}_{2}^{-}, \mathrm{NO}, \mathrm{NO}_{2}, \mathrm{CO}, \mathrm{K}_{2}\left[\mathrm{NiCl}_{4}\right]$,
$\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right] \mathrm{Cl}_{3}, \mathrm{~K}_{2}\left[\mathrm{Ni}(\mathrm{CN})_{4}\right]$
✓

Answer

6
$\mathrm{O}_{2} \rightarrow 2$ unpaired electrons according to MOT
$\mathrm{O}_{2}{ }^{+} \rightarrow 1$ unpaired electrons according to MOT
$\mathrm{O}_{2}^{-} \rightarrow 1$ unpaired electrons according to MOT
NO $\rightarrow$ odd electron species
$\mathrm{NO}_{2} \rightarrow$ odd electron species
$\mathrm{K}_{2}\left[\mathrm{NiCl}_{4}\right] \rightarrow \mathrm{Ni}^{2+} \Rightarrow 3 \mathrm{~d}^{8}$ weak Ligand, C.N. $=4$
$\Rightarrow$ Tetrahedral, Paramagnetic with 2 unpaired electrons

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