Which of the following is not a redox equation? a. al2o3 (aq) + 6naoh (aq) → 2al(oh)3 (s) + 3na2o (aq) b. 2h3o+ (aq) + cu (s) + 2hno3 (aq) → cu2+ (aq) + 2no2 (g) + 4h2o (l) c. o2 (g) + cl2 (g) → 2ocl (g) d. 5hso3– (aq) + 2io3– (aq) → i2 (aq) + 5so42– (aq) = 3h+ (aq) + h2o (l) e. none of the above