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  4. The most basic hydroxide from following is

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Q. The most basic hydroxide from following is

MHT CETMHT CET 2018The d-and f-Block Elements

Solution:

Due to lanthanoid contraction, the basic character of hydroxides decreases from $La ^{3+}$ to $Lu ^{3+}$

As a result, covalent nature of $Ln— OH$ bond also increases. Thus, the most basic hydroxide among the given option is $La( OH )_{3}$