A) \[La\,{{(OH)}_{3}}\] is less basic than \[Lu{{(OH)}_{3}}\]
B) In lanthanoide series, ionic radius of \[L{{n}^{3+}}\] ion decreases.
C) La is actually an element of transition series rather than lanthanoides
D) Atomic radius of Zn and \[Hf\] are same because of lanthanoides contraction.
Correct Answer: A
Solution :
\[La{{(OH)}_{3}}\]is more basic than\[Lu{{(OH)}_{3}}\]. In lanthanoides the basic character of hydroxide decreases as the ionic radius decreases.
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