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The correct basic strength of hydroxides of lanthanide ions will be:

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La⁺³ > Lu⁺³ > Ce⁺³ > Eu⁺³

Ce⁺³ > Lu⁺³ > La⁺³ > Eu⁺³

Lu⁺³ > Ce⁺³ > Eu⁺³ > La⁺³

La⁺³ > Ce⁺³ > Eu⁺³ > Lu⁺³

answer is D.

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