CBSE 2025 · Region 1 · Set 3 · Q32 · 5 marks

(A)

In the following complex ions, explain the type of hybridisation, shape and magnetic property : $\displaystyle \left(\mathbf{2} \frac{\mathbf{1}}{\mathbf{2}} \times \mathbf{2}=\mathbf{5}\right)$

(a)

$\displaystyle \left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}$

(b)

$\displaystyle \left[\mathrm{NiCl}_{4}\right]^{2-}$ (At. Nos. : $\displaystyle \mathrm{Fe}=26, \mathrm{Ni}=28$ )

(b)

OR 32. (B) (a) Write IUPAC names of the following :

(i)

$\displaystyle \left[\mathrm{Co}\left(\mathrm{H}_{2} \mathrm{O}\right)(\mathrm{CN})(\mathrm{en})_{2}\right]^{2+}$

(ii)

$\displaystyle \left[\mathrm{PtCl}_{4}\right]^{2-}$

(iii)

$\displaystyle \left[\mathrm{Cr}\left(\mathrm{NH}_{3}\right)_{4} \mathrm{Cl}(\mathrm{ONO})\right]^{+}$

(b)

What is spectrochemical series ? Write the difference between a strong field ligand and a weak field ligand.

CBSE Class 12 Chemistry past-paper question from the 2025board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.