JEE Mains · Chemistry · STD 12 - 5. Co-ordination chemistry
The correct order of \(\left[\mathrm{FeF}_6\right]^{3-},\left[\mathrm{CoF}_6\right]^{3-},\left[\mathrm{Ni}(\mathrm{CO})_4\right]\) and \(\left[\mathrm{Ni}(\mathrm{CN})_4\right]^{2-}\) complex species based on the number of unpaired electrons present is which?
- A \(\left[\mathrm{FeF}_6\right]^{3-} \gt \left[\mathrm{CoF}_6\right]^{3-} \gt \left[\mathrm{Ni}(\mathrm{CN})_4\right]^{2-} \gt \left[\mathrm{Ni}(\mathrm{CO})_4\right]\)
- B \(\left[\mathrm{Ni}(\mathrm{CN})_4\right]^{2-} \gt \left[\mathrm{FeF}_6\right]^{3-} \gt \left[\mathrm{CoF}_6\right]^{3-} \gt \left[\mathrm{Ni}(\mathrm{CO})_4\right]\)
- C \(\left[\mathrm{CoF}_6\right]^{3-} \gt \left[\mathrm{FeF}_6\right]^{3-} \gt \left[\mathrm{Ni}(\mathrm{CO})_4\right] \gt \left[\mathrm{Ni}(\mathrm{CN})_4\right]^{2-}\)
- D \(\left[\mathrm{FeF}_6\right]^{3-} \gt \left[\mathrm{CoF}_6\right]^{3-} \gt \left[\mathrm{Ni}(\mathrm{CN})_4\right]^{2-}=\left[\mathrm{Ni}(\mathrm{CO})_4\right]\)
Answer & Solution
Correct Answer
(D) \(\left[\mathrm{FeF}_6\right]^{3-} \gt \left[\mathrm{CoF}_6\right]^{3-} \gt \left[\mathrm{Ni}(\mathrm{CN})_4\right]^{2-}=\left[\mathrm{Ni}(\mathrm{CO})_4\right]\)
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