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Chemistry · 2026 · 3 marks
CBSE 2026 · Region 5 · Set 3 · Q26
(a) A coordination compound CrCl_3 · 6 H_2 O is mixed with excess of AgNO_3 solution, three moles of AgCl are 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, 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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