Question
Which of the following statements is not correct?
A.
$$La{\left( {OH} \right)_3}$$ is less basic than $$Li{\left( {OH} \right)_3}$$
B.
In lanthanide series, ionic radius of $$L{n^{3 + }}$$ $$ion$$ decreases
C.
$$La$$ is actually an element of transition series rather lanthanide
D.
Atomic radius of $$Zr$$ and $$Hf$$ are same because of lanthanide contraction
Answer :
$$La{\left( {OH} \right)_3}$$ is less basic than $$Li{\left( {OH} \right)_3}$$
Solution :
$$L{a^{3 + }}$$ $$ions$$ larger than $$L{i^{3 + }}.$$ So, it easily gives $$O{H^ - }$$ $$ion$$ $$La{\left( {OH} \right)_3}$$ is more basic than $$Li{\left( {OH} \right)_3}.$$ In lanthanides the basic character of hydroxides
decreases as the ionic radius decreases.