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Consider the following statements: (...

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?

A

I and III

B

II and III

C

II only

D

I and II

Text Solution

Verified by Experts

The correct Answer is:
B
`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 `Ce^(3+)`.
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