Which of the following elements exhibits oxidation states other than $+3 ?$

Which of the following elements exhibits oxidation states other than $+3 ?$
  1. Ce
  2. Gd
  3. Lu
  4. La

Solution

$\mathrm{Ce} \longrightarrow[\mathrm{Xe}] 4 \mathrm{f}^{2} 5 \mathrm{~d}^{0} 6 \mathrm{~s}^{2}$ Ce exhibits $+4$ oxidation state.

Asked in: MHT CET 2020 (14 Oct Shift 2)

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