Q1. In the reaction \( \ce{3Cu + 8HNO3 -> 3Cu(NO3)2 + 2NO + 4H2O} \), what is the oxidizing agent?A. \( \ce{Cu} \)B. \( \ce{NO} \)C. \( \ce{Cu(NO3)2} \)D. \( \ce{HNO3} \)
Q2. Which reaction involves a redox process where the reducing agent is a compound containing sulfur?A. \( \ce{2Na + Cl2 -> 2NaCl} \)B. \( \ce{Fe + CuSO4 -> FeSO4 + Cu} \)C. \( \ce{2H2O2 -> 2H2O + O2} \)D. \( \ce{SO2 + 2H2 -> S + 2H2O} \)
Q3. In the reaction \( \ce{2NaI + Cl2 -> 2NaCl + I2} \), what is the reducing agent?A. \( \ce{Cl2} \)B. \( \ce{NaCl} \)C. \( \ce{I2} \)D. \( \ce{NaI} \)
Q5. Which reaction involves a redox process where the reducing agent contains phosphorus?A. \( \ce{2Na + Cl2 -> 2NaCl} \)B. \( \ce{P4 + 6Cl2 -> 4PCl3} \)C. \( \ce{Fe + S -> FeS} \)D. \( \ce{2H2O2 -> 2H2O + O2} \)
Q6. In the reaction \( \ce{Sn + 2CuSO4 -> SnSO4 + Cu2SO4} \), what is the reducing agent?A. \( \ce{CuSO4} \)B. \( \ce{Sn} \)C. \( \ce{SnSO4} \)D. \( \ce{Cu2SO4} \)
Q7. Which of the following is a redox reaction involving a non-metal?A. \( \ce{2Na + Cl2 -> 2NaCl} \)B. \( \ce{CaO + CO2 -> CaCO3} \)C. \( \ce{HCl + NH3 -> NH4Cl} \)D. \( \ce{P4 + 10Cl2 -> 4PCl5} \)
Q8. Which element is oxidized in the reaction \( \ce{2MnO2 + 4KOH + O2 -> 2K2MnO4 + 2H2O} \)?A. OxygenB. PotassiumC. ManganeseD. Hydrogen
Q9. For the reaction \( \ce{Sb2S3 + 6HCl -> 2SbCl3 + 3H2S} \), which species undergoes reduction?A. None of theseB. \( \ce{Sb2S3} \)C. \( \ce{HCl} \)D. \( \ce{SbCl3} \)
Q10. What is the change in oxidation number of nitrogen in the reaction \( \ce{N2 -> 2NH3} \) when balanced with H₂?A. +3B. -3C. +6D. -6