Which of the following statement is wrong regarding lanthanoids?

Statement I : ${\mathrm{CeO}}_2$ can be used for oxidation of aldehydes and ketones.

Statement II : Aqueous solution of ${\mathrm{EuSO}}_4$ is a strong reducing agent. In the light of the above statements, choose the correct answer from the options given below:

Which of the following lanthanoid is diamagnetic?

Atomic no's $\mathrm{Sm}=62, \mathrm{Ce}=58, \mathrm{Eu}=63, \mathrm{Yb}=70$

Identify the formula of compound $\left(\mathrm{B}\right)$ formed in following reaction.

(i) Lanthanoide $\left(\mathrm{Ln}\right)$ burnt in oxygen forming compound $\left(\mathrm{A}\right)$

(ii) Compound $\left(\mathrm{A}\right)$ reacts with ${\mathrm{CO}}_2$ in excess to form compound $\left(\mathrm{B}\right)$