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Chemistry · 2026 · 3 marks
Coordination CompoundsDefinitions of Some Important Terms Pertaining to Coordination Compounds3 marksApplyshort answer
CBSE 2026 · Region 5 · Set 2 · Q26
(a) A coordination compound CrCl_3 · 6 H_2 O is mixed with excess of AgNO_3 solution, one mole of AgCl is precipitated per mole of the compound.…
(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.
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CBSE Class 12 Chemistry past-paper question from the 2026 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.