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Chemistry · 2026 · 2 marks
The d-and f-Block ElementsGeneral Properties of the Transition Elements (d-Block)2 marksUnderstandvery short answer
CBSE 2026 · Region 2 · Set 3 · Q19
(a) Why second ionization enthalpies of chromium and copper are exceptionally higher than those of their neighbouring elements? 1 + 1 (b) Why…
(a)
Why second ionization enthalpies of chromium and copper are exceptionally higher than those of their neighbouring elements ? $\displaystyle 1$ + $\displaystyle 1$
(b)
Why transition elements form interstitial compounds ?
Marking-scheme solution
(a)
Because of stable half-filled d5 in Cr+ and completely filled d-orbitals in Cu+.
Removal of electron is difficult so ionisation enthalpies are higher.
(b)
Small atoms like H,C etc fit into the voids of transition metals in their crystal
lattice resulting in the formation of interstitial compounds.
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CBSE Class 12 Chemistry past-paper question from the 2026 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.