Q1. Which element shows a fractional oxidation state in \( \ce{FeS2} \)?A. IronB. OxygenC. HydrogenD. Sulfur
Q2. Which reaction involves a redox process where the reducing agent contains a halogen?A. \( \ce{2Na + O2 -> Na2O2} \)B. \( \ce{S + O2 -> SO2} \)C. \( \ce{2NaI + MnO2 + 2H2SO4 -> I2 + MnSO4 + 2H2O + Na2SO4} \)D. \( \ce{2H2O2 -> 2H2O + O2} \)
Q3. Which of the following reactions involves both oxidation and reduction?A. \( \ce{4Fe + 3O2 -> 2Fe2O3} \)B. \( \ce{NaOH + HCl -> NaCl + H2O} \)C. \( \ce{CaCO3 -> CaO + CO2} \)D. \( \ce{AgNO3 + NaCl -> AgCl + NaNO3} \)
Q4. Which of the following is not a redox reaction?A. \( \ce{2Na + 2H2O -> 2NaOH + H2} \)B. \( \ce{Fe + CuSO4 -> FeSO4 + Cu} \)C. \( \ce{2H2O2 -> 2H2O + O2} \)D. \( \ce{BaCl2 + H2SO4 -> BaSO4 + 2HCl} \)
Q5. Which reaction involves a redox process where the oxidizing agent is a compound with nitrogen?A. \( \ce{2Na + Cl2 -> 2NaCl} \)B. \( \ce{Fe + S -> FeS} \)C. \( \ce{2H2O2 -> 2H2O + O2} \)D. \( \ce{3Cu + 8HNO3 -> 3Cu(NO3)2 + 2NO + 4H2O} \)
Q7. Which reaction is a combination redox reaction involving a non-metal?A. \( \ce{N2 + 3H2 -> 2NH3} \)B. \( \ce{2Mg + CO2 -> 2MgO + C} \)C. \( \ce{NaCl + KNO3 -> NaNO3 + KCl} \)D. \( \ce{CaO + H2O -> Ca(OH)2} \)
Q8. In the reaction \( \ce{As2S3 + 7H2O2 + 2H2O -> 2H3AsO4 + 3H2SO4} \), which element’s oxidation number increases the most?A. SulfurB. ArsenicC. OxygenD. Hydrogen
Q10. Which of the following reactions involves the loss of hydrogen, indicating an oxidation process?A. \( \ce{CH3OH + O -> HCHO + H2O} \)B. \( \ce{2H2 + O2 -> 2H2O} \)C. \( \ce{Fe + 2HCl -> FeCl2 + H2} \)D. \( \ce{Na + H2O -> NaOH + H2} \)