Question: Which one of the following lanthanoids does not form $\mathrm{MO}_{2}$ ? [M is lanthanoid metal]
$\operatorname{Pr}$
Dy
$\mathrm{Nd}$
$\mathrm{Yb}$
Correct Option: 1
Solution:
$\mathrm{Yb}$ is the only element that do not form $\mathrm{MO}_{2}$ type oxide
