Which of the following statement is not correct?

Options

A. `La(OH)_3` is less basic than `Lu(OH)_3`
B. In lanthanoid series, ionic radius decreases from `La^(3+)` to `Lu^(3+)` ion.
C. La is actually an element of transition series rather than lanthanoids
D. Atomic radius of Zr and Hf are same because of lanthanoid contraction .

Answer

A

Explanation

` La(OH)_3` is more basic than `Lu(OH)_3` because as the size of lanthanoid ions decreases from Last to `Lu^(3+)`, the covalent character increases and hence basic strength of their hydroxides decreases.