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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 2 · Set 1 · Q11
Account for the following: (i) Transition metals and their compounds show catalytic activities. (ii) Zn, Cd and Hg are non-transition elements. (iii)…
Account for the following:
(i)
Transition metals and their compounds show catalytic activities.
(ii)
Zn, Cd and Hg are non-transition elements.
(iii)
Zr and Hf are of almost identical atomic radii. $\displaystyle 9$
Marking-scheme solution
(i)
Variable or multiple oxidation state / ability to form complexes / they provide large surface area for adsorption (utilises (n-$\displaystyle 1$) d and ns electrons for bonding).
(ii) Zn, Cd and Hg have completely filled \(\displaystyle d\)-orbitals in its ground state as well as in its oxidised state.
(iii) Because of lanthanoid contraction / poor shielding effect of 4f orbitals.
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