Chemistry · 2025
JEE Main · 4 April 2025, Shift 2 · Q60
The correct order of [ FeF_6]^3-,[ CoF_6]^3-,[ Ni ( CO )_4] and [ Ni ( CN )_4]^2- complex species based on the number of unpaired electrons present…
The correct order of $\displaystyle \left[\mathrm{FeF}_6\right]^{3-},\left[\mathrm{CoF}_6\right]^{3-},\left[\mathrm{Ni}(\mathrm{CO})_4\right]$ and $\displaystyle \left[\mathrm{Ni}(\mathrm{CN})_4\right]^{2-}$ complex species based on the number of unpaired electrons present is :
Official answer
From NTA’s final answer key for this paper.
(3)
$\displaystyle \left[\mathrm{FeF}_6\right]^{3-}>\left[\mathrm{CoF}_6\right]^{3-}>\left[\mathrm{Ni}(\mathrm{CN})_4\right]^{2-}=\left[\mathrm{Ni}(\mathrm{CO})_4\right]$
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JEE Main 2025 Chemistry question, with the answer from NTA’s final answer key. Where our answers come from.