CBSE 2025 · Region 5 · Set 2 · Q24 · 3 marks
(a)Based on Valence Bond Theory, explain the geometry and magnetic character of $\displaystyle \left[\mathrm{NiCl}_{4}\right]^{2-}$. [Atomic number : $\displaystyle \mathrm{Ni}=28$ ](b)Draw the possible isomers of $\displaystyle \left[\mathrm{Co}(\mathrm{en})_{2} \mathrm{Cl}_{2}\right]^{+}$.
(a)
Based on Valence Bond Theory, explain the geometry and magnetic character of $\displaystyle \left[\mathrm{NiCl}_{4}\right]^{2-}$. [Atomic number : $\displaystyle \mathrm{Ni}=28$ ]
(b)
Draw the possible isomers of $\displaystyle \left[\mathrm{Co}(\mathrm{en})_{2} \mathrm{Cl}_{2}\right]^{+}$.
Marking-scheme solution
(a)
Ni2+ (3d8).
sp3 hybridisation, tetrahedral,
Paramagnetic
(b)
Optical isomer of Cis-form[Co(en)2Cl2]+
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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.