Balancing Redox Reactions
Chemistry ⇒ Redox Reactions and Electrochemistry
Balancing Redox Reactions starts at 10 and continues till grade 12.
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See sample questions for grade 10
Assign the oxidation number to carbon in CO2.
Assign the oxidation number to chlorine in ClO3-.
Assign the oxidation number to nitrogen in NO3-.
Assign the oxidation number to sulfur in H2SO4.
Balance the following redox reaction in acidic solution: Cr2O72- + SO32- → Cr3+ + SO42-
Balance the following redox reaction in acidic solution: H2O2 + MnO4- → O2 + Mn2+
Balance the following redox reaction in acidic solution: IO3- + I- → I2
Balance the following redox reaction in acidic solution: MnO4- + Fe2+ → Mn2+ + Fe3+
Which of the following is a disproportionation reaction? (1) 2H2 + O2 → 2H2O (2) 2H2O2 → 2H2O + O2 (3) Zn + CuSO4 → ZnSO4 + Cu (4) Fe + S → FeS
Which of the following is NOT a step in balancing redox reactions? (1) Assigning oxidation numbers (2) Balancing atoms other than O and H (3) Adding electrons to both sides of the equation (4) Balancing charges by adding electrons
Which of the following is reduced in the reaction: Zn + Cu2+ → Zn2+ + Cu? (1) Zn (2) Cu2+ (3) Zn2+ (4) Cu
Which of the following is the correct balanced half-reaction for the oxidation of Fe2+ to Fe3+? (1) Fe2+ → Fe3+ + e- (2) Fe2+ + e- → Fe3+ (3) Fe2+ + 2e- → Fe3+ (4) Fe2+ → Fe3+ + 2e-
Fill in the blank: In basic solution, after balancing atoms and charges in a redox reaction, ________ ions are added to neutralize H+ ions.
Fill in the blank: In the reaction 2Fe2+ + Cl2 → 2Fe3+ + 2Cl-, the oxidizing agent is ________.
Fill in the blank: In the reaction 2H2 + O2 → 2H2O, the reducing agent is ________.
Fill in the blank: In the reaction 2Na + Cl2 → 2NaCl, Na is ________ and Cl2 is ________.
True or False: Electrons are written on the left side of the equation in a reduction half-reaction.
True or False: In a redox reaction, the oxidizing agent is always reduced.
True or False: In a redox reaction, the substance that loses electrons is called the oxidizing agent.
True or False: In a redox reaction, the total charge on both sides of the equation must be equal after balancing.
