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Identify the statement that is incorrect from the following:

1. La(OH)3 has a lower basicity compared to Li(OH)3
2. La belongs to the transition series rather than the lanthanides
3. The atomic radii of Zr and Hf are identical due to the lanthanide contraction
4. The ionic radii of Ln+3 ions decrease across the lanthanide series

Correct answer: La(OH)3 has a lower basicity compared to Li(OH)3

Solution

La(OH)3 is more basic than Li(OH)3 because lanthanides form hydroxides that are generally more basic than alkali metal hydroxides due to their larger ionic size and lower electronegativity.

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