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CBSE Class 12 · 2002 · Delhi Compartment · d and f Block ElementsVery Short Answer

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Name the lanthanoid element which exhibits a +4 oxidation state besides the +3 oxidation state.

Answer: Cerium (Ce⁴⁺, attaining the stable 4f⁰ configuration).

Solution

Cerium (Z = 58) shows +4 besides +3: losing four electrons gives Ce with the extra-stable noble-gas (4f) configuration.
(Ce is a good oxidant, reverting to the common +3 state.)

CBSE Class 12 Board · 2002 · Delhi Compartment · Subjective

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