CBSE 2022 · Region 2 · Set 1 · Q4 · 3 marks
Write the hybridisation and magnetic character of the following complexes :(i)$\displaystyle \left[\mathrm{NiCl}_{4}\right]^{2-}$(ii)$\displaystyle \left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+}$(iii)$\displaystyle \left[\mathrm{FeF}_{6}\right]^{3-}$ [Atomic number : $\displaystyle \mathrm{Ni}=28, \mathrm{Co}=27, \mathrm{Fe}=26$ ](b)Write the IUPAC name of the following complex : $\displaystyle \left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{4}\left(\mathrm{H}_{2} \mathrm{O}\right) \mathrm{Cl}\right] \mathrm{Cl}_{2}$(ii)What is the difference between an Ambidentate ligand and a Bidentate ligand?(iii)Out of $\displaystyle \left[\mathrm{Fe}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+}$ and $\displaystyle \left[\mathrm{Fe}\left(\mathrm{C}_{2} \mathrm{O}_{4}\right)_{3}\right]^{3-}$, which complex is more stable and why ?
Write the hybridisation and magnetic character of the following complexes :
(i)
$\displaystyle \left[\mathrm{NiCl}_{4}\right]^{2-}$
(ii)
$\displaystyle \left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+}$
(iii)
$\displaystyle \left[\mathrm{FeF}_{6}\right]^{3-}$
[Atomic number : $\displaystyle \mathrm{Ni}=28, \mathrm{Co}=27, \mathrm{Fe}=26$ ]
(b)
Write the IUPAC name of the following complex : $\displaystyle \left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{4}\left(\mathrm{H}_{2} \mathrm{O}\right) \mathrm{Cl}\right] \mathrm{Cl}_{2}$
(ii)
What is the difference between an Ambidentate ligand and a Bidentate ligand?
(iii)
Out of $\displaystyle \left[\mathrm{Fe}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+}$ and $\displaystyle \left[\mathrm{Fe}\left(\mathrm{C}_{2} \mathrm{O}_{4}\right)_{3}\right]^{3-}$, which complex is more stable and why ?
Marking-scheme solution
(a) (i) \(\displaystyle s p^{3}\), paramagnetic
(ii) \(\displaystyle d^{2} s p^{3}\), diamagnetic
(iii) \(\displaystyle s p^{3} d^{2}\), paramagnetic
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CBSE Class 12 Chemistry past-paper question from the 2022board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.