CBSE 2026 · Region 5 · Set 2 · 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, one mole of AgCl is 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 : $\displaystyle \left[\mathrm{Fe}(\mathrm{CN})_{6}\right]^{3-}$. [Atomic number : $\displaystyle \mathrm{Fe}=26$ ](c)Why is $\displaystyle \left[\mathrm{Ti}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{3+}$ coloured ? [Atomic number : Ti = $\displaystyle 22$]
(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, one mole of AgCl is 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 : $\displaystyle \left[\mathrm{Fe}(\mathrm{CN})_{6}\right]^{3-}$. [Atomic number : $\displaystyle \mathrm{Fe}=26$ ]
(c)
Why is $\displaystyle \left[\mathrm{Ti}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{3+}$ coloured ? [Atomic number : Ti = $\displaystyle 22$]
Marking-scheme solution
(a)
[Cr(H2O) 4Cl2] Cl. 2H2O
(b)
+$\displaystyle 3$, d2sp3
(c)
Due to d-d transition / Due to presence of unpaired electron which undergoes d-d
transition.
Coordination CompoundsDefinitions of Some Important Terms Pertaining to Coordination CompoundsApplyshort_answermedium
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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.