Q2. In the reaction \( \ce{2MnO2 + 2KOH + O2 -> 2K2MnO4 + H2} \), which element is reduced?A. ManganeseB. HydrogenC. OxygenD. Potassium
Q3. Which of the following reactions is an example of disproportionation?A. \( \ce{2Na + Cl2 -> 2NaCl} \)B. \( \ce{Zn + CuSO4 -> ZnSO4 + Cu} \)C. \( \ce{Cl2 + 2NaOH -> NaCl + NaClO + H2O} \)D. \( \ce{2KClO3 -> 2KCl + 3O2} \)
Q4. Which reaction involves a redox process where oxygen is neither gained nor lost by the element oxidized?A. \( \ce{2Na + O2 -> Na2O2} \)B. \( \ce{S + O2 -> SO2} \)C. \( \ce{2FeSO4 + I2 -> Fe2(SO4)3 + 2HI} \)D. \( \ce{2CuO + C -> 2Cu + CO2} \)
Q5. In \( \ce{2FeCl3 + H2S -> 2FeCl2 + S + 2HCl} \), which species contains the element reduced?A. \( \ce{H2S} \)B. \( \ce{S} \)C. \( \ce{FeCl3} \)D. \( \ce{HCl} \)
Q6. Which element undergoes reduction in the reaction \( \ce{2Na + 2H2O -> 2NaOH + H2} \)?A. SodiumB. OxygenC. NitrogenD. Hydrogen
Q8. Which reaction represents a decomposition redox process?A. \( \ce{CaCO3 -> CaO + CO2} \)B. \( \ce{2KClO3 -> 2KCl + 3O2} \)C. \( \ce{NH4Cl -> NH3 + HCl} \)D. \( \ce{2NaHCO3 -> Na2CO3 + H2O + CO2} \)
Q9. Which reaction involves a redox process where the oxidizing agent contains sulfur?A. \( \ce{2Na + Cl2 -> 2NaCl} \)B. \( \ce{C + O2 -> CO2} \)C. \( \ce{2Fe + 3SO2 -> Fe2O3 + 3S} \)D. \( \ce{2H2O2 -> 2H2O + O2} \)
Q10. Which reaction involves a redox process where a single element acts as both oxidizing and reducing agent?A. \( \ce{3HNO2 -> HNO3 + 2NO + H2O} \)B. \( \ce{2Na + Cl2 -> 2NaCl} \)C. \( \ce{Fe + CuSO4 -> FeSO4 + Cu} \)D. \( \ce{2H2 + O2 -> 2H2O} \)