First slide

Transition elements

Question

Which of the following statement is not correct?

Moderate

A

$La (OH)_{3}$ is less basic than $Lu (OH)_{3}$
B

In lanthanide series ionic radius of ${Ln}^{3 +}$ * 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

Solution

$La (OH$ $)_{3}$ is more basic than $Lu (OH)_{3} .$ This is because ionic
size of ${La}^{3 +}$ on is more than ${La}^{3 +}$ ion (Fajan's rule).

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