Which of the following Lanthanoid ions are diamagnetic?

Identify all the correct statements for Lanthanide contraction.
$(A)$ The covalent properties of the Lanthanide metal hydroxides increase from $La$ to $Lu$.
$(B)$ The chemical reactivity decreases from $La$ to $Lu$.
$(C)$ $La(OH)_3$ is more basic than $Lu(OH)_3$.
$(D)$ $Zr$ and $Hf$ have about the same radius.
$(E)$ Separation of Lanthanides from one another is easy.

Identify the lanthanoid element from the following.

Describe the general chemical reactions of lanthanoids with the help of a diagram and state their uses.

Write a reaction with lanthanoids $(Ln)$:

Which is not the correct statement? (At. nos. $Ce = 58, Lu = 71, La = 57, Yb = 70$)