Write the name of two metal which used in maximum composition in mischmetal. Calculate the value of the magnetic moment of $$V^{+2}$$

Write the name of two metals which are used in maximum composition in mischmetal?

The composition of mischmetal is:

Calculate the value of magnetic moment of $V^{+2}$ ?

A metal complex having composition $Cr(N{H}_3{)}_{4}C{l}_{2}Br$ has been isolated in two forms $\left(A\right)$ and $\left(B\right)$. The form $\left(A\right)$ reacts with $AgN{O}_3$ to give a white precipitate readily soluble in dilute aqueous ammonia, whereas $\left(B\right)$ gives a pale yellow precipitate soluble in concentrated ammonia. Write the formula of $\left(A\right)$ and $\left(B\right)$ and state the hybridization of chromium in each. Calculate their magnetic moments (spin- only value).

Which of the following metal ions has a calculated magnetic moment value of $\sqrt{24}$ B.M?