In comparison of ferrous salts,ferric salts are

The electronic configurations of four elements are:
$(i) \; [Xe] \; 6s^1$
$(ii) \; [Xe] \; 4f^{14}5d^16s^2$
$(iii) \; [Ne] \; 3s^23p^5$
$(iv) \; [Ar] \; 3d^74s^2$
Which one of the following statements about these elements is not true?

What is the net charge on a ferrous ion?

Why is $_{21}Sc$ not considered a transition element?

Misch metal is an alloy of $:-$

Addition of non-metals like $B$ and $C$ to the interstitial sites of a transition metal results in the metal becoming: