NEET Chemistry: Redox Reactions — Practice Set 2

Q1. In \( \ce{2Na2S2O3 + I2 -> Na2S4O6 + 2NaI} \), which element undergoes oxidation?

Q2. In the reaction \( \ce{2Ag2O -> 4Ag + O2} \), which species is reduced?

Q3. In the reaction \( \ce{3CuO + 2NH3 -> 3Cu + N2 + 3H2O} \), how many electrons are gained per copper atom?

Q4. What is the oxidation number of sulfur in \( \ce{SO3} \)?

Q5. In \( \ce{2H3PO3 -> H3PO4 + PH3} \), how many electrons are transferred per mole of \( \ce{H3PO3} \)?

Q6. In \( \ce{2CrO3 + 3H2O2 + 2KOH -> 2KCrO4 + 4H2O} \), how many electrons are transferred per mole of \( \ce{CrO3} \)?

Q7. In \( \ce{2H2S + SO2 -> 3S + 2H2O} \), what is the total number of electrons transferred per mole of \( \ce{SO2} \)?

Q8. Which reaction is an example of a displacement redox reaction?

Q9. What is the oxidation number of phosphorus in \( \ce{H3PO4} \)?

Q10. Which of the following is a redox reaction involving a displacement process?

ChemistryRedox Reactions

Set 2 of 20

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In \( \ce{2Na2S2O3 + I2 -> Na2S4O6 + 2NaI} \), which element undergoes oxidation?