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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 3 · Set 3 · Q4
(i) Why are melting points of transition metals high? (ii) Why the transition metals generally form coloured compounds? (iii) Why E^° value for Mn^3+…
(i)
Why are melting points of transition metals high ?
(ii)
Why the transition metals generally form coloured compounds ?
(iii)
Why $\displaystyle \mathrm{E}^{\circ}$ value for $\displaystyle \mathrm{Mn}^{3+} / \mathrm{Mn}^{2+}$ couple is highly positive?
Marking-scheme solution
(i) Because of strong intermetallic bonding / strong interatomic interactions forces.
(ii) Because of the presence of unpaired electrons in \(\displaystyle d\)-orbital / due to \(\displaystyle d-d\) transition.
(iii) Because of much larger third ionization enthalpy of Mn / stable halffilled \(\displaystyle 3 d^{5}\) configuration in \(\displaystyle \mathrm{Mn}^{2+}\).
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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.