Which one of the following is not a redox reaction?
A) 2H₂(g) + O₂(g) → 2H₂O(l)
B) Zn(s) + H₂SO₄(aq) → ZnSO₄(aq) + H₂(g)
C) H₂O(l) + NH₃(g) → NH4⁺(aq) + OH⁻(aq)
D) 6FeSO₄(aq) + K₂Cr2₂O₇(aq) + 7H₂SO₄(aq) → Cr₂(SO₄)₃(aq) + 3Fe₂(SO₄)₃(aq) + K₂SO₄(aq) + 7H₂O(l)
E) Cl₂(g) + 2KBr(aq) → Br₂(l) + 2KCl(aq)
Answer: C