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Why is La(OH)3 more basic than Lu(OH)3 ?...

Why is `La(OH)_3` more basic than `Lu(OH)_3` ?

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`La (OH)_3` is more basic than `Lu(OH)_3`. Due to lanthanoids contraction the size of Lanthonoids ion decrease regularly with increase in atomic size. As such `(Lu(OH)_3` has more covalent character than `La (OH)_3`, therefore `La (OH)_3` is more basic than `Lu(OH)_3`.
Due to Fajan Rule:
Basic Character `prop (1)/("Covalent bond")`
`prop` Greater will be polarisation.
`prop` Small size of cation
`prop` large of anions.
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