Q1. In the reaction \( \ce{2MnO2 + 2KOH + O2 -> 2K2MnO4 + H2} \), which species is reduced?A. \( \ce{MnO2} \)B. \( \ce{O2} \)C. \( \ce{KOH} \)D. \( \ce{K2MnO4} \)
Q5. In \( \ce{2MnO4^- + 5C2O4^2- + 16H^+ -> 2Mn^2+ + 10CO2 + 8H2O} \), which species contains the element oxidized?A. \( \ce{MnO4^-} \)B. \( \ce{Mn^2+} \)C. \( \ce{C2O4^2-} \)D. \( \ce{CO2} \)
Q6. Which of the following is a redox reaction?A. \( \ce{HCl + NaOH -> NaCl + H2O} \)B. \( \ce{NaCl + AgNO3 -> AgCl + NaNO3} \)C. \( \ce{CuO + H2 -> Cu + H2O} \)D. \( \ce{CaCO3 -> CaO + CO2} \)
Q7. In the reaction \( \ce{2KI + Br2 -> 2KBr + I2} \), which species is the reducing agent?A. \( \ce{Br2} \)B. \( \ce{KBr} \)C. \( \ce{I2} \)D. \( \ce{KI} \)
Q8. In the reaction \( \ce{2Na + Cl2 -> 2NaCl} \), what is the oxidizing agent?A. \( \ce{Cl2} \)B. \( \ce{Na} \)C. \( \ce{NaCl} \)D. None of these
Q9. In \( \ce{2K2Cr2O7 + 14HCl -> 2CrCl3 + 2KCl + 3Cl2 + 7H2O} \), how many electrons are transferred?A. 8B. 10C. 6D. 12
Q10. In \( \ce{2NiS + 3O2 -> 2NiO + 2SO2} \), which species is oxidized?A. \( \ce{NiO} \)B. \( \ce{O2} \)C. \( \ce{SO2} \)D. \( \ce{NiS} \)