Outer electronic configuration of Mn is $3{\mathrm{d}}^{5}4{\mathrm{s}}^2$ which means it exhibits +7 oxidation state
Zinc does not form coloured ions as it has completely filled $3{\mathrm{d}}^{10}4{\mathrm{s}}^2$ configuration.
In $[\mathrm{C}\mathrm{o}{\mathrm{F}}_6{]}^{3-},\mathrm{C}{\mathrm{o}}^{3+}$ is a ${\mathrm{d}}^7$ system. Fluoride is a weak field ligand and hence it can not cause pairing of electrons.

Sc can form a maximum of +3 oxidation state as it has an outer electronic configuration of $3{\mathrm{d}}^{1}4{\mathrm{s}}^2$ .
Zn exhibits only +2 oxidation state as this O.S. is the most stable one for it.
Hence i, v are correct while ii,iii,iv are incorrect.