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Chemistry · 2022 · 3 marks
The d-and f-Block ElementsGeneral Properties of the Transition Elements (d-Block)3 marksUnderstandshort answer
CBSE 2022 · Region 4 · Set 1 · Q6
(i) Which ion amongst the following is colourless and why? Ti^4+, Cr^3+, V^3+ (Atomic number of Ti =22, Cr =24, V =23 ) (ii) Why is Mn^2+ much more…
(i)
Which ion amongst the following is colourless and why? \[\mathrm{Ti}^{4+}, \mathrm{Cr}^{3+}, \mathrm{V}^{3+} \] (Atomic number of $\displaystyle \mathrm{Ti}=22, \mathrm{Cr}=24, \mathrm{~V}=23$ )
(ii)
Why is $\displaystyle \mathrm{Mn}^{2+}$ much more resistant than $\displaystyle \mathrm{Fe}^{2+}$ towards oxidation ?
(iii)
Highest oxidation state of a metal is shown in its oxide or fluoride only. Justify the statement.
Marking-scheme solution
(i) \(\displaystyle \mathrm{Ti}^{4+}\) no unpaired electrons in d-orbital / no d-d transition / \(\displaystyle \mathrm{d}^{0}\) configuration.
(ii) \(\displaystyle \mathrm{Mn}^{2+}\) is \(\displaystyle d^{5}\) and is more stable than \(\displaystyle \mathrm{Mn}^{3+}\left(d^{4}\right)\) whereas \(\displaystyle \mathrm{Fe}^{3+}\left(d^{5}\right)\) is more stable than \(\displaystyle \mathrm{Fe}^{2+}\left(d^{4}\right)\).
(iii) Because fluorine and oxygen are highly electronegative / both are strong oxidising agents.
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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.