CBSE 2026 · Region 5 · Set 1 · 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, two 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 following complex : \[\left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{3+} \quad[\text { Atomic number of } \mathrm{Fe}=26] \](c)Why is $\displaystyle \left[\mathrm{Ni}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}$ coloured ? [Atomic number of Ni = $\displaystyle 28$]
(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, two 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 following complex : \[\left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{3+} \quad[\text { Atomic number of } \mathrm{Fe}=26] \]
(c)
Why is $\displaystyle \left[\mathrm{Ni}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}$ coloured ? [Atomic number of Ni = $\displaystyle 28$]
Marking-scheme solution
(a)
[Cr(H2O)5Cl] Cl2.H2O
(b)
sp3d2
(c)
Due to d-d transition / Due to presence of unpaired electrons 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.