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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 1 · Q8
Define transition metals. Why Zn, Cd and Hg are not called transition metals? How is the variability in oxidation states of transition metals…
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.
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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.