# What are Reducing Agents? And why are they used in chemical reactions?

Jun 16, 2018

they generally have a low Oxidation number (as ${S}^{2} - , {I}^{-}$ or ${H}_{2} S$ that give S), but $C {l}^{-}$ is a weak reducing, and ${F}^{-}$ isn't at all.
Other usefull reducing agents are: some metals as Mg, Al, Zn and ${H}_{2} , N {O}_{2}^{-} , S {O}_{2} , S {O}_{3}^{2 -} , S {n}^{2} + , F {e}^{2} +$, ethanol .