Q1. Which element shows fractional oxidation state in \( \ce{Fe3O4} \)?A. OxygenB. HydrogenC. SulfurD. Iron
Q2. In the reaction \( \ce{2FeSO4 -> Fe2O3 + SO2 + SO3} \), which element is oxidized?A. SulfurB. OxygenC. IronD. None of these
Q3. Which of the following is a decomposition redox reaction?A. \( \ce{CaCO3 -> CaO + CO2} \)B. \( \ce{2NaCl -> 2Na + Cl2} \)C. \( \ce{KClO3 -> KCl + O2} \)D. \( \ce{2HgO -> 2Hg + O2} \)
Q5. Which of the following reactions is not a redox reaction?A. \( \ce{2H2 + O2 -> 2H2O} \)B. \( \ce{Zn + 2HCl -> ZnCl2 + H2} \)C. \( \ce{FeCl3 + 3NaOH -> Fe(OH)3 + 3NaCl} \)D. \( \ce{2Cu + O2 -> 2CuO} \)
Q6. In \( \ce{2Tl + I2 -> 2TlI} \), which species undergoes oxidation?A. \( \ce{Tl} \)B. \( \ce{I2} \)C. \( \ce{TlI} \)D. None of these
Q7. In \( \ce{2KMnO4 + 16H2SO4 + 10NaBr -> 5Br2 + 2MnSO4 + 8H2O + 5Na2SO4 + K2SO4} \), how many electrons are transferred?A. 8B. 12C. 6D. 10
Q8. Which of the following reactions demonstrates the addition of oxygen, indicating an oxidation process?A. \( \ce{2Cu + O2 -> 2CuO} \)B. \( \ce{2H2O -> 2H2 + O2} \)C. \( \ce{FeSO4 + H2 -> Fe + H2SO4} \)D. \( \ce{PbS + O3 -> PbSO4} \)
Q10. In the reaction \( \ce{2MnO2 + 4KOH + O2 -> 2K2MnO4 + 2H2O} \), how many electrons are transferred per Mn atom?A. 1B. 3C. 4D. 2