Q14 / 180 · KCET 2014 · Chemistry
The correct statement is
- AThe extent of actinoid contraction is almost the same as lanthanoid contraction.
- Correct answerB\( C e^{4+} \) in aqueous solution is not known.
- CThe earlier members of lanthanoid series resemble calcium in their chemical properties.
- DIn general, lanthanoids and actinoids do not show variable oxidation states.
Solution
Most stable oxidation state for lanthanoid is \( +3 \).
Therefore, \( \mathrm{Ce}^{4+} \) acts as a good oxidizing agent in solution due to ability to get reduced to \( \mathrm{Ce}^{3+} \) easily.
Hence, \( C e^{4+} \) in aqueous solution is not known.
Therefore, \( \mathrm{Ce}^{4+} \) acts as a good oxidizing agent in solution due to ability to get reduced to \( \mathrm{Ce}^{3+} \) easily.
Hence, \( C e^{4+} \) in aqueous solution is not known.
Hence, the correct answer is option: 'B'.