Oxidation numbers, balancing redox equations, redox titrations.
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Q1 · Redox Reactions (Class 11 — ~20% weight) · EASY
In the reaction: 2KMnO4 + 16HCl → 2KCl + 2MnCl2 + 5Cl2 + 8H2O, what is the change in oxidation number of manganese?
Q2 · Redox Reactions (Class 11 — ~20% weight) · MEDIUM
In a redox titration, 25.0 mL of 0.02 M KMnO4 solution is required to completely oxidize 50.0 mL of FeSO4 solution in acidic medium. The reaction is: MnO4^- + 5Fe^2+ + 8H^+ → Mn^2+ + 5Fe^3+ + 4H2O. What is the molarity of the FeSO4 solution?
Q3 · Redox Reactions (Class 11 — ~20% weight) · HARD
When the following redox reaction is balanced in acidic medium: Cr2O7^2- + C2O4^2- → Cr^3+ + CO2, what is the coefficient of H^+ in the balanced equation?
Q4 · Redox Reactions (Class 11 — ~20% weight) · MEDIUM
In the reaction: MnO₄²⁻ + 4H⁺ + 2e⁻ → MnO₂ + 2H₂O, what is the change in oxidation state of manganese?