1.

Consider the following statement (i) La(OH)_(3) is the least basic among hydroxides of lanthanides. (ii) Zr^(4+) and Hf^(4+) posses almost the same ionic radii. (iii) Ce^(4+) can act as an oxidizing agent. Which of the above is/are true?

Answer»

(i) and (iii)
(ii) and (iii)
(ii) only
(i) and (ii)

Solution :As a result of lanthanide CONTRACTION `Zr^(4+)` and `Hf^(4+)` possess almost the same ionic radii. `Ce^(4+)` is an oxidising agent. `Ce^(4+)` gains electron to acquire more STABLE `Ce^(3+)` STATE. `LA(OH)_(3)` is the most basic among lanthanide hydroxides.


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