Question

Which of the following statements is not correct?

• A. $La(OH)_3 $ is less basic than $Li(OH)_3 $
• B. In lanthanide series, ionic radius of $Ln^{3+}$ 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 1

Answer: (A)

$La ^{3+}$ ions larger than $Li ^{3+}$, So, it easily gives $OH ^{-}$ion $La ( OH )_{3}$ is more basic than $Li ( OH )_{3}$. In lanthanides the basic character of hydroxides decreases as the ionic radius decreases.