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The most common oxidation state of Lanthanoid elements is +3. Which of the following is likely to deviate easily from +3 oxidation state?

1. Ce(At. No. 58)
2. La (At. No. 57)
3. Lu (At. No. 71)
4. Gd(At. No. 64)

Correct answer: Ce(At. No. 58)

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