› cms › libWorksheet # 5 Balancing Redox Reactions in Acid and Basic ... State of the change that represents oxidation, reduction or neither. Use oxidation #s. Remember that if the oxidation # increases it means oxidation and when it decreases it mean reduction! 18. MnO 2 → Mn 2O 3 19. NH 3 → NO 2 20. HClO 4 → HCl + H 2O 21. O 2 → O2-22. P 2O 5 → P 4H 10 Determine the oxidation number 23. H 2SO 4 22. HSO 4 ...