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Oxidation and Reduction

Chemistry ⇒ Redox Reactions and Electrochemistry

Oxidation and Reduction starts at 10 and continues till grade 12. QuestionsToday has an evolving set of questions to continuously challenge students so that their knowledge grows in Oxidation and Reduction. How you perform is determined by your score and the time you take. When you play a quiz, your answers are evaluated in concept instead of actual words and definitions used.
See sample questions for grade 12
Assign the oxidation number to chlorine in KClO4.
Assign the oxidation number to chromium in Cr2O72-.
Assign the oxidation number to nitrogen in NH4+.
Calculate the oxidation number of sulfur in Na2S2O3.
Assign the oxidation number to chlorine in KClO4.
Assign the oxidation number to chromium in Cr2O72-.
Assign the oxidation number to nitrogen in NH4+.
Calculate the oxidation number of sulfur in Na2S2O3.
Which of the following elements can act as both an oxidizing and a reducing agent? (1) Oxygen (2) Hydrogen (3) Chlorine (4) Nitrogen
Which of the following is a redox reaction? (1) CaCO3 → CaO + CO2 (2) 2KClO3 → 2KCl + 3O2 (3) NaOH + HCl → NaCl + H2O (4) AgNO3 + NaCl → AgCl + NaNO3
Which of the following is NOT a characteristic of a redox reaction? (1) Transfer of electrons (2) Change in oxidation number (3) Formation of a precipitate (4) Simultaneous oxidation and reduction
Which of the following is NOT a redox reaction? (1) 2H2 + O2 → 2H2O (2) AgNO3 + NaCl → AgCl + NaNO3 (3) Zn + 2HCl → ZnCl2 + H2 (4) Fe2O3 + 3CO → 2Fe + 3CO2
Fill in the blank: In the reaction 2Al + 3CuSO4 → Al2(SO4)3 + 3Cu, Al is __________.
Fill in the blank: In the reaction 2K + Br2 → 2KBr, Br2 is __________.
Fill in the blank: In the reaction Cu2+ + Zn → Cu + Zn2+, Zn acts as the __________ agent.
Fill in the blank: In the reaction Fe2+ → Fe3+ + e-, Fe2+ is __________.
State whether the following statement is true or false: In the reaction 2Na + Cl2 → 2NaCl, sodium is reduced.
True or False: In a redox reaction, the substance that is reduced acts as the oxidizing agent.
True or False: In a redox reaction, the total number of electrons lost equals the total number of electrons gained.
True or False: In the reaction 2H2O2 → 2H2O + O2, oxygen is both oxidized and reduced.