Chemistry - Redox Reactions Question with Solution | TestHub

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.