| I. \[La{{(OH)}_{3}}\] is the least basic among hydroxides of lanthanides. |
| II. \[Z{{r}^{4+}}\] and \[H{{f}^{4+}}\] possess almost the same ionic radii. |
| III. \[C{{e}^{4+}}\] can act as an oxidising agent. |
A) I and III
B) II and III
C) II only
D) I and II
Correct Answer: B
Solution :
The basic character of hydroxides decreases from La \[{{(OH)}_{3}}\] to Lu\[{{(OH)}_{3}}\]. Due to smaller size of Lu. The Lu\[-OH\] bond attains more covalent character. La\[{{(OH)}_{3}}\] is the most basic among hydroxides of lanthanoids. Statement II and III are true.
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