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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 2 · Q19
(a) Why is third ionization enthalpy of manganese very high? 1 + 1 (b) Why Zn, Cd and Hg are not regarded as transition elements?
(a)
Why is third ionization enthalpy of manganese very high ? $\displaystyle 1$ + $\displaystyle 1$
(b)
Why Zn, Cd and Hg are not regarded as transition elements ?
Marking-scheme solution
(a)
Mn2+ = [Ar] 3d54s0. It has a stable half- filled configuration hence energy
required to remove third electron is very high.
(b)
Because they have completely filled d orbitals in their ground state as well as
in common oxidation state.
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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.