Which of the following statements is not correct ?

Options

A. `La(OH)_(3)` is less BASIC than `Lu(OH)_(3)`
B. In lanthanide series ionic of `Ln^(2+)` ion decreases
C. La is actully an element of transition series rather lanthanide series.
D. Atomic radius of Zr and Hf are same because of lanthanide contraction

Answer

A

Explanation

The basic strength of `Ln(OH)_(3)` decreases as the ionic radius decreases form Ce to Lu. Thus `Ce(OH)_(3)` is the most basic, and `Lu(OH)_(3)` , is the least basic.