Which from following lanthanoids exhibits no effective magnetic moment in +3 state?

Which from following lanthanoids exhibits no effective magnetic moment in +3 state?
  1. Ce
  2. La
  3. Gd
  4. Eu

Solution

La in +3 state shows $4 \mathrm{f}^0$, electronic configuration, hence has zero effective magnetic moment.

Asked in: MHT CET 2024 (03 May Shift 2)

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