Q1. In \( \ce{TeO2 + 2H2 -> Te + 2H2O} \), which species is reduced?A. \( \ce{H2} \)B. \( \ce{TeO2} \)C. \( \ce{Te} \)D. \( \ce{H2O} \)
Q2. In \( \ce{2As + 3H2S -> As2S3 + 3H2} \), what is the total number of electrons transferred per mole of \( \ce{As} \)?A. 2B. 3C. 4D. 6
Q4. In \( \ce{2FeSO4 + H2O2 + H2SO4 -> Fe2(SO4)3 + 2H2O} \), which species is reduced?A. \( \ce{FeSO4} \)B. \( \ce{Fe2(SO4)3} \)C. \( \ce{H2SO4} \)D. \( \ce{H2O2} \)
Q5. In the reaction \( \ce{5H2S + 2KMnO4 + 3H2SO4 -> 5S + 2MnSO4 + K2SO4 + 8H2O} \), which element is oxidized?A. ManganeseB. HydrogenC. SulfurD. Oxygen
Q6. Which reaction represents a decomposition redox process?A. \( \ce{CaCO3 -> CaO + CO2} \)B. \( \ce{2Ag2O -> 4Ag + O2} \)C. \( \ce{NH4Cl -> NH3 + HCl} \)D. \( \ce{Na2CO3 -> Na2O + CO2} \)
Q7. In the reaction \( \ce{Pb + PbO2 + 2H2SO4 -> 2PbSO4 + 2H2O} \), what is the oxidizing agent?A. \( \ce{Pb} \)B. \( \ce{H2SO4} \)C. \( \ce{PbSO4} \)D. \( \ce{PbO2} \)
Q8. Which of the following reactions involves a redox process with a non-metal?A. \( \ce{CaO + H2O -> Ca(OH)2} \)B. \( \ce{NaCl + KNO3 -> NaNO3 + KCl} \)C. \( \ce{HCl + NH3 -> NH4Cl} \)D. \( \ce{S8 + 8O2 -> 8SO2} \)
Q9. In \( \ce{2CuCl2 + 4KI -> 2CuI + 4KCl + I2} \), which species is oxidized?A. \( \ce{CuCl2} \)B. \( \ce{CuI} \)C. \( \ce{KCl} \)D. \( \ce{KI} \)
Q10. Which compound contains sulfur with an oxidation number higher than in \( \ce{SO2} \)?A. \( \ce{H2S} \)B. \( \ce{SCl2} \)C. \( \ce{SO3} \)D. \( \ce{S2O3^2-} \)