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Coordination Compounds question

2025 · 4 Apr · Shift 2 · Q17
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  5. /2025 · 4 Apr · Shift 2 · Q17

Coordination Compounds question

2025 · 4 Apr · Shift 2 · Q17

JEE MainChemistryCoordination CompoundsMCQ+4 / −1
The correct order of [FeF6]3−,[CoF6]3−,[Ni(CO)4]\left[\mathrm{FeF}_6\right]^{3-},\left[\mathrm{CoF}_6\right]^{3-},\left[\mathrm{Ni}(\mathrm{CO})_4\right][FeF6​]3−,[CoF6​]3−,[Ni(CO)4​] and [Ni(CN)4]2−\left[\mathrm{Ni}(\mathrm{CN})_4\right]^{2-}[Ni(CN)4​]2− complex species based on the number of unpaired electrons present is:
  1. A
    [CoF6]3−>[FeF6]3−>[Ni(CO)4]>[Ni(CN)4]2−\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-}[CoF6​]3−>[FeF6​]3−>[Ni(CO)4​]>[Ni(CN)4​]2−
  2. B
    [FeF6]3−>[CoF6]3−>[Ni(CN)4]2−>[Ni(CO)4]\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][FeF6​]3−>[CoF6​]3−>[Ni(CN)4​]2−>[Ni(CO)4​]
  3. C
    [FeF6]3−>[CoF6]3−>[Ni(CN)4]2−=[Ni(CO)4]\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][FeF6​]3−>[CoF6​]3−>[Ni(CN)4​]2−=[Ni(CO)4​]
  4. D
    [Ni(CN)4]2−>[FeF6]3−>[CoF6]3−>[Ni(CO)4]\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][Ni(CN)4​]2−>[FeF6​]3−>[CoF6​]3−>[Ni(CO)4​]
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