Which of the Following Chemical Reactions Is an Oxidation-Reduction Reaction

Multiple Choice

Which of the following chemical reactions is an oxidation-reduction reaction?

A) Zn(s) + S(s) → ZnS(s)
B) H₂SO₄(aq) + 2NaOH(aq) → Na₂SO₄(aq) + 2H₂O(l)
C) NaOH(aq) + HCl(aq) → NaCl(aq) + H₂O(l)
D) AgNO₃(aq) + NaCl(aq) → AgCl(s) + NaNO₃(aq)
E) CO₂(aq) + H₂O(aq) → H₂CO₃(aq)