D-And F-Block Elements Ques 516
Question: Which of the following statement is not correct-
Options:
A) $ La{{( OH )}_3} $ is less basic than $ Lu{{( OH )}_3} $ .
B) In lanthanide series ionic radius of $ L{{n}^{3+}} $ ions decreases.
C) La is actually an element of transition series rather than lanthanide series.
D) Atomic radii of Zr and Hf are same because of lanthanide contraction.
Show Answer
Answer:
Correct Answer: A
Solution:
$ La{{( OH )}_3} $ is more basic than $ Lu{{( OH )}_3} $ .
This is because ionic size of $ L{{a}^{3+}} $ ion is more than $ L{{u}^{3+}} $ ion (Fajan’s rule).
