1.

The most basic hydroxide from following is

Answer»

`Pr(OH)_(3)(Z=59)`
`Sm(OH)_(3)(Z=62)`
`Ho(OH)_(3)(Z=67)`
`LA(OH)_(3)(Z=57)`

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 gicen option is `La(OH)_(3)`.


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