1.

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

Answer»

I and III
II and III
Only II
I and II

Solution :The basic character of hydroxide decreases from `LA(OH)_(3) to Lu(OH)_(3)`.Due to smaller size of Lu, the Lu-OH BOND attains more covalent character while `ZR^(4+) and Hf(4+)` has same ionic radii and`CE^(4+)` is an oxidising agent.


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