Which of the following transition metal is present in misch metal?

Write a reaction with lanthanoids $(Ln)$:

If the ionic radius of $_{57}La^{3+}$ is $1.06 \ \mathring{A}$,then the ionic radius of $_{71}Lu^{3+}$ will be approximately close to which of the following values in $\mathring{A}$?

In which of the following properties do $Lanthanoids$ and $Actinoids$ show similarity?

Lanthanoids $(Ln)$ are well known for their $+3$ oxidation state. Which of the following statements is $NOT$ applicable to them?

Which of the following has $6$ unpaired $f-$electrons?