Sulfide ion in redox reactions is: a) only a reducing agent b) only an oxidizing agent

Sulfide ion in redox reactions is: a) only a reducing agent b) only an oxidizing agent c) and an oxidizing agent and a reducing agent d) neither an oxidizing agent nor a reducing agent

Answer: sulfide ion in redox reactions is only a reducing agent (answer option under the letter a).
Explanation of the solution to the problem: in the sulfide ion S ^ (2-) sulfur is in the oxidation state -2, for sulfur this is the minimum oxidation state, which means that it can no longer accept electrons to its external level, it can only give them now, and the atom that donates electrons is a reducing agent.