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 oxidizing agent. |
A) (I) and (III)
B) (II) and (III)
C) (II) Only
D) (I) and (II)
E) (I)-only
Correct Answer: B
Solution :
I. The basic character of hydroxides decreases from\[La{{(OH)}_{3}}\]to\[Lu{{(OH)}_{3}}\].Thus\[La{{(OH)}_{3}}\]is the most basic among lanthanoid hydroxides. |
II. \[Z{{r}^{4+}}\]and\[H{{f}^{4+}}\]is almost similar in size due to lanthanide contraction. |
III. Cerium exhibits +4 oxidation state in aqueous solution and possesses the tendency to attain +3 oxidation state. |
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