SCCC CHEM: Redox Reactions Practice Problems 1. Consider the following redox reaction: NO(g) + KMnO4(aq) → MnO2(s) + KNO3(aq) a. Give the oxidation number for each element in the compounds below: In KMnO4: K = _____, Mn=_____, and O = _____. In KNO3: K = _____, N=_____, and O = _____. Indicate the neutral element or the ion (or element with its oxidation number) in a compound that is oxidized or reduced and the reactants that served as the oxidizing and the reducing agents below: b. The reactant oxidized is ___________________, and the oxidizing agent is _______________. The reactant reduced is ___________________, and the reducing agent is _______________. c. The total number of electrons transferred in this reaction is _________. 2. Consider the following redox reaction: Fe2O3(s) + 3 CO (g) → 2 Fe (s) + 3 CO2(g) a. Give the oxidation number for each element in the compounds below: In CO2: C = _____, and O = _____. b. The reactant oxidized is ___________________, and the oxidizing agent is _______________. The reactant reduced is ___________________, and the reducing agent is _______________. c. The total number of electrons transferred in this reaction is _________. 3. Consider the following : H2SO3(aq) + 2 Mn(s) + 4HCl(aq) → S(s) + 2 MnCl2(aq) + 3 H2O(l) a. Give the oxidation number for each element in the compounds below: In H2SO3: H=_____, S = _____, and O = _____. In MnCl2: Mn = _____ and Cl = _____. b. The reactant oxidized is ___________________, and the oxidizing agent is _______________. The reactant reduced is ___________________, and the reducing agent is _______________. c. The total number of electrons transferred in this reaction is _________.3. Consider the following reaction: Pb(s) + PbO2(s) + H2SO4(aq) → 2 PbSO4(s) + 2 H2O(l) Indicate the neutral element or the ion (or element with its oxidation number) in a compound that is oxidized or reduced and the reactants that served as the oxidizing and the reducing agents below: a. The reactant oxidized is ___________________, and the oxidizing agent is _______________. The reactant reduced is ___________________, and the reducing agent is _______________. b. The total number of electrons transferred in this reaction is _________. 4. Consider the following reaction: 2 H2O2(aq) → 2 H2O(l) + O2(aq) Indicate the neutral element or the ion (or element with its oxidation number) in a compound that is oxidized or reduced and the reactants that served as the oxidizing and the reducing agents below: a. The reactant oxidized is ___________________, and the oxidizing agent is _______________. The reactant reduced is ___________________, and the reducing agent is _______________. b. The total number of electrons transferred in this reaction is _________. 5. Consider the following reaction: 3 HNO2(aq) → H2O(l) + HNO3(aq) + 2NO(g) Indicate the neutral element or the ion (or element with its oxidation number) in a compound that is oxidized or reduced and the reactants that served as the oxidizing and the reducing agents below: a. The reactant oxidized is ___________________, and the oxidizing agent is _______________. The reactant reduced is ___________________, and the reducing agent is _______________. b. The total number of electrons transferred in this reaction is _________. 6. Consider the following reaction: Zn + 2MnO2 + 2NH4Cl → ZnCl2 + Mn2O3 + 2NH3 + H2O Indicate the neutral element or the ion (or element with its oxidation number) in a compound that is oxidized or reduced and the reactants that served as the oxidizing and the reducing agents below: a. The reactant oxidized is ___________________, and the oxidizing agent is _______________. The reactant reduced is ____________________, and the reducing agent is _______________. b. The total number of electrons transferred in this reaction is