Question

Name a substance that will reduce ferric ions to ferrous ions.?

Answer 1

Ferric ions in solution can be reduced to ferrous ions by using hydrogen sulphide.

$H_{2}S+F{e}^{3+}\left(aq\right)\to F{e}^{2+}\left(aq\right)+2H^{+}\left(aq\right)+S\left(s\right)$