CBSE 2024 · Region 3 · Set 1 · Q33 · 5 marks

Attempt any five of the following :

(a)

Write the IUPAC name of the complex : $\displaystyle \left[\mathrm{Co}\left(\mathrm{H}_{2} \mathrm{O}\right)(\mathrm{CN})(\mathrm{en})_{2}\right]^{2+}$

(b)

Why is geometrical isomerism not possible in tetrahedral complexes having two different types of unidentate ligands coordinated with the central metal ion ?

(c)

Arrange the following complex ions in increasing order of their crystal field splitting energy $\displaystyle \left(\Delta_{0}\right)$ : \[\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+},\left[\mathrm{CoF}_{6}\right]^{3-},\left[\mathrm{Co}(\mathrm{CN})_{6}\right]^{3-} \]

(d)

Write the hybridization and magnetic character of the complex $\displaystyle \left[\mathrm{Ni}(\mathrm{CO})_{4}\right]$ on the basis of valence bond theory. [Atomic No. : Ni = $\displaystyle 28$]

(e)

Out of $\displaystyle \left[\mathrm{CoF}_{6}\right]^{3-}$ and $\displaystyle \left[\mathrm{Co}\left(\mathrm{C}_{2} \mathrm{O}_{4}\right)_{3}\right]^{3-}$, which one complex is :

(i)

more stable?

(ii)

the high spin complex ?

(f)

What is the difference between an ambidentate ligand and bidentate ligand ?

(g)

Write the electronic configuration of $\displaystyle \mathrm{d}^{5}$ in terms of $\displaystyle \mathrm{t}_{2 \mathrm{~g}}$ and $\displaystyle \mathrm{e}_{\mathrm{g}}$ in an octahedral field when :

(i)

$\displaystyle \Delta_{0}>\mathrm{P}$, and

(ii)

$\displaystyle \Delta_{0}<\mathrm{P}$

CBSE Class 12 Chemistry past-paper question from the 2024board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.