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Chemistry · 2022 · 3 marks
The d-and f-Block ElementsGeneral Properties of the Transition Elements (d-Block)3 marksAnalyseshort answer
CBSE 2022 · Region 1 · Set 1 · Q4
Following ions of 3d-transition series are given: Ti^4+, V^3+, Cr^3+, Mn^3+ (Atomic number: Ti =22, V =23, Cr =24, Mn =25 ) Identify the ion which is…
Following ions of 3d-transition series are given : \[\mathrm{Ti}^{4+}, \mathrm{V}^{3+}, \mathrm{Cr}^{3+}, \mathrm{Mn}^{3+} \] (Atomic number : $\displaystyle \mathrm{Ti}=22, \mathrm{~V}=23, \mathrm{Cr}=24, \mathrm{Mn}=25$)
Identify the ion which is
(i)
most stable in aqueous solution.
(ii)
a strong oxidising agent.
(iii)
colourless in aqueous solution. Give suitable reason in each.
Marking-scheme solution
(i) \(\displaystyle \mathrm{Cr}^{3+}\), due to stable \(\displaystyle t_{2 g}^{3}\) configuration.
(ii) \(\displaystyle \mathrm{Mn}^{3+}\), as Mn is more stable in +$\displaystyle 2$ oxidation state / stable half-filled \(\displaystyle \mathrm{d}^{5}\) configuration of \(\displaystyle \mathrm{Mn}^{2+}\).
(iii) \(\displaystyle \mathrm{Ti}^{4+}\), no unpaired electrons / no d-d transition / \(\displaystyle \mathrm{d}^{0}\) configuration.
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CBSE Class 12 Chemistry past-paper question from the 2022 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.