CBSE 2022 · Region 1 · Set 2 · Q8 · 3 marks
Following ions of 3d transition series are given : \[\mathrm{V}^{3+}, \mathrm{Cr}^{2+}, \mathrm{Cu}^{+}, \mathrm{Fe}^{2+}, \] (Atomic number : $\displaystyle \mathrm{V}=23, \mathrm{Cr}=24, \mathrm{Cu}=29, \mathrm{Fe}=26$ ) Identify the ion which is(a)unstable in aqueous solution.(b)a strong reducing agent in aqueous solution.(c)colourless in aqueous solution ? Give suitable reason in each.
Following ions of 3d transition series are given : \[\mathrm{V}^{3+}, \mathrm{Cr}^{2+}, \mathrm{Cu}^{+}, \mathrm{Fe}^{2+}, \] (Atomic number : $\displaystyle \mathrm{V}=23, \mathrm{Cr}=24, \mathrm{Cu}=29, \mathrm{Fe}=26$ )
Identify the ion which is
(a)
unstable in aqueous solution.
(b)
a strong reducing agent in aqueous solution.
(c)
colourless in aqueous solution ? Give suitable reason in each.
Marking-scheme solution
(a)
\(\displaystyle \mathrm{Cu}^{+,}\)shows disproportionation / \(\displaystyle \mathrm{Fe}^{2+}\), stable half filled \(\displaystyle \mathrm{d}^{5}\) configuration
(b)
\(\displaystyle \mathrm{Cr}^{2+}, \mathrm{Cr}^{2+}\) changes to \(\displaystyle \mathrm{Cr}^{3+}\) with half filled \(\displaystyle \mathrm{t}_{2 \mathrm{~g}}{ }^{3}\) configuration.
The d-and f-Block ElementsGeneral Properties of the Transition Elements (d-Block)Understandshort_answermedium
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CBSE Class 12 Chemistry past-paper question from the 2022board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.