Chemistry · 2025
JEE Main · 22 January 2025, Shift 1 · Q61
From the magnetic behaviour of [ NiCl_4]^2- (paramagnetic) and [ Ni ( CO )_4] (diamagnetic), choose the correct geometry and oxidation state.
From the magnetic behaviour of $\displaystyle \left[\mathrm{NiCl}_4\right]^{2-}$ (paramagnetic) and $\displaystyle \left[\mathrm{Ni}(\mathrm{CO})_4\right]$ (diamagnetic), choose the correct geometry and oxidation state.
Official answer
From NTA’s final answer key for this paper.
(2)
$\displaystyle \left[\mathrm{NiCl}_4\right]^{2-}: \mathrm{Ni}^{\mathrm{II}}$, tetrahedral
$\displaystyle \left[\mathrm{Ni}(\mathrm{CO})_4\right]: \mathrm{Ni}(0)$, tetrahedral
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JEE Main 2025 Chemistry question, with the answer from NTA’s final answer key. Where our answers come from.