CBSE 2026 · Region 5 · Set 3 · Q26 · 3 marks
(a)A coordination compound $\displaystyle \mathrm{CrCl}_{3} \cdot 6 \mathrm{H}_{2} \mathrm{O}$ is mixed with excess of $\displaystyle \mathrm{AgNO}_{3}$ solution, three moles of AgCl are precipitated per mole of the compound. Write the structural formula of the coordination compound.(b)Write the oxidation state and hybridisation of the central metal in the given complex : $\displaystyle \left[\mathrm{Cr}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+}$. [Atomic number : $\displaystyle \left.\mathrm{Cr}=24\right]$(c)Why is $\displaystyle \left[\mathrm{Sc}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{3+}$ colourless ?
(a)
A coordination compound $\displaystyle \mathrm{CrCl}_{3} \cdot 6 \mathrm{H}_{2} \mathrm{O}$ is mixed with excess of $\displaystyle \mathrm{AgNO}_{3}$ solution, three moles of AgCl are precipitated per mole of the compound. Write the structural formula of the coordination compound.
(b)
Write the oxidation state and hybridisation of the central metal in the given complex : $\displaystyle \left[\mathrm{Cr}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+}$. [Atomic number : $\displaystyle \left.\mathrm{Cr}=24\right]$
(c)
Why is $\displaystyle \left[\mathrm{Sc}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{3+}$ colourless ?
Marking-scheme solution
(a)
[Cr(H2O)$\displaystyle 6$] Cl3
(b)
Cr+$\displaystyle 3$, d2sp3
(c)
Due to absence of unpaired electrons, no d-d transition takes place.
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CBSE Class 12 Chemistry past-paper question from the 2026board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.