Which of the following statement is not correct?

Options

A. `La(OH)_3` is less basic than `Lu(OH)_3`
B. In lanthanide series ionic radius of `Ln^(3+)` ions decreases
C. La is actualy an element of transition series rather than lanthanide series
D. Atomic radii of Zr and Hf are same because of lanthanide contraction.

Answer

a

Explanation

`La(OH)_3` is more basic than `Lu(OH)_3`. This is because ionic of `La^(3+)` ion is more than `Lu^(3+)` ion (Fajan's rule).