1.

Out of Lu(OH)_(3) and La(OH)_(3) which is more basic and why?

Answer»

SOLUTION :(i) As we move from `Ce^(3+)` to `Lu^(3+)`, the BASIC character of `Lu^(3+)` IONS decreases.
(ii) Due to the DECREASE in the SIZE of `Lu^(3+)` ions, the ionic character of Lu-OH bond decreases, covalent character increases which results in the decrease in the basicity,
(iii) Hence, `La(OH)_(3)` is more basic than `Lu(OH)_(3)`


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