A) \[La{{\left( OH \right)}_{3}}\] is less basic than \[Lu{{\left( OH \right)}_{3}}\].
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.
Correct Answer: A
Solution :
[a] \[La{{\left( OH \right)}_{3}}\] is more basic than\[Lu{{\left( OH \right)}_{3}}\]. This is because ionic size of \[L{{a}^{3+}}\] ion is more than \[L{{u}^{3+}}\] ion (Fajan's rule).
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