Consider the following statements:
(I) La`(OH)_(3)` is the least basic among the hydroxides of Ianthanoids.
(II) `Zr^(4+)` and `Hf^(4+)` possess almost same ionic radii.
(III) `Cr^(4+)` can act as an oxidising agent .
which of the above statement is/ are true?

Options

A. I and II
B. II and III
C. II only
D. I and II

Explanation

`La(OH)_(3)` is most basic. Hence, (I) is wrong. (II) is correct due to lanthanoid contraction. (III) is correct because `Ce^(4+)` tends to change to stable `Cr^(3+)`