CBSE 2022 · Region 3 · Set 1 · Q8 · 3 marks
Define transition metals. Why Zn, Cd and Hg are not called transition metals ? How is the variability in oxidation states of transition metals different from that of p -block elements?
Marking-scheme solution
Metals which have incomplete \(\displaystyle d\)-orbital in ground state or in its oxidation state.
Because of completely filled \(\displaystyle d\)-orbitals in ground state or in its oxidation state.
Oxidation states differ by +$\displaystyle 1$ unit in transition metals whereas by +$\displaystyle 2$ units in \(\displaystyle p\)-block elements / heavier elements are stable in higher oxidation state in transition elements whereas heavier elements are stable in lower oxidation states in p-block elements.
The d-and f-Block ElementsGeneral Properties of the Transition Elements (d-Block)Understandshort_answermedium
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CBSE Class 12 Chemistry past-paper question from the 2022board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.