Q6 / 180 · KCET 2025 · Chemistry

A member of the Lanthanoid series which is well known to exhibit +4 oxidation state is

  • A
    Samarium
  • B
    Europium
  • C
    Erbium
  • Correct answer
    D
    Cerium

Solution

$\mathrm{Ce}:[\mathrm{Xe}] 4 \mathrm{f}^1 5 \mathrm{~d}^1 6 \mathrm{~s}^2$ $\mathrm{Ce}^{+4}:[\mathrm{Xe}] 4 \mathrm{f}^{\circ} 5 \mathrm{~d}^{\circ} 6 \mathrm{~s}^{\circ}$ Since $\mathrm{Ce}^{+4}$ has stable noble gas configuration, it is well known to show +4 oxidation sate.

Hence, the correct answer is option: 'D'.

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