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Chemistry · 2023 · 5 marks
The d-and f-Block ElementsGeneral Properties of the Transition Elements (d-Block)5 marksUnderstandlong answer
CBSE 2023 · Region 1 · Set 3 · Q34
(a) (i) In 3d series, which transition element has positive E_M^2+ / M value and why? (ii) Name a member of lanthanide series which is well-known to…
(a)(i)
In 3d series, which transition element has positive $\displaystyle \mathrm{E}_{\mathrm{M}^{2+} / \mathrm{M}}$ value and why ?
(ii)
Name a member of lanthanide series which is well-known to show +$\displaystyle 4$ oxidation state.
(b)
Give reason :
(i)
The highest oxidation state is exhibited in oxoanions of transition metals.
(ii)
$\displaystyle \mathrm{HCl}$ is not used to acidify $\displaystyle \mathrm{KMnO}_{4}$ solution.
Marking-scheme solution
(a) (i) Copper, Copper, due to high \(\displaystyle \Delta_{\text {sub }} \mathrm{H}\) and low \(\displaystyle \Delta_{\text {Hyd }} \mathrm{H}\) / The sum of enthalpies of sublimation and ionisation of copper is not balanced by the hydration enthalpy.
(ii) Cerium /Terbium
(b)
(i) Due to ability of oxygen to form multiple bonds with transition metals.
(ii) \(\displaystyle \mathrm{KMnO}_{4}\) being an oxidising agent oxidises HCl to chlorine \(\displaystyle \left(\mathrm{Cl}_{2}\right)\).
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CBSE Class 12 Chemistry past-paper question from the 2023 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.