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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 1 · Q26
(a) A coordination compound CrCl_3 · 6 H_2 O is mixed with excess of AgNO_3 solution, two 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, 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.
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