sulfate reduction

Types of Inorganic Salts That Can Undergo Reduction Reactions: Nitrates, Sulfur-Containing Salts, Halogen Oxyanion Salts, and Metal Salts

Not all inorganic salts are suitable as substrates for reduction reactions. Inorganic salts that can undergo reduction usually contain a central element in a relatively high oxidation state, such as N(+5) in NO₃⁻, S(+6) in SO₄²⁻, Cl(+7) in ClO₄⁻, Cr(+6) in CrO₄²⁻, as well as Fe(III), Mn(IV), ...