Question

What is the metal oxidation state in `Fe(SO_4)_2`?

Answer 1

That's `Fe^(4+)`! It is probably a typo.

Explanation:

The sulfate ion is `SO_4^(2-)`. There is a `"ferrous sulfate, "FeSO_4", and a ferric sulfate, " Fe_2(SO_4)_3`. `Fe(IV+)` salts would be rare.