Q1. In \( \ce{2Na2S2O3 + I2 -> Na2S4O6 + 2NaI} \), which element undergoes oxidation?A. IodineB. SodiumC. OxygenD. Sulfur
Q2. In the reaction \( \ce{2Ag2O -> 4Ag + O2} \), which species is reduced?A. \( \ce{O2} \)B. \( \ce{Ag} \)C. \( \ce{Ag2O} \)D. None of these
Q3. In the reaction \( \ce{3CuO + 2NH3 -> 3Cu + N2 + 3H2O} \), how many electrons are gained per copper atom?A. 1B. 2C. 3D. 4
Q5. In \( \ce{2H3PO3 -> H3PO4 + PH3} \), how many electrons are transferred per mole of \( \ce{H3PO3} \)?A. 1B. 3C. 4D. 2
Q6. In \( \ce{2CrO3 + 3H2O2 + 2KOH -> 2KCrO4 + 4H2O} \), how many electrons are transferred per mole of \( \ce{CrO3} \)?A. 2B. 1C. 0D. 3
Q7. In \( \ce{2H2S + SO2 -> 3S + 2H2O} \), what is the total number of electrons transferred per mole of \( \ce{SO2} \)?A. 2B. 6C. 4D. 8
Q8. Which reaction is an example of a displacement redox reaction?A. \( \ce{2Na + 2H2O -> 2NaOH + H2} \)B. \( \ce{2Al + 3NiSO4 -> Al2(SO4)3 + 3Ni} \)C. \( \ce{2H2O2 -> 2H2O + O2} \)D. \( \ce{CaCO3 -> CaO + CO2} \)
Q10. Which of the following is a redox reaction involving a displacement process?A. \( \ce{2Al + 3NiSO4 -> Al2(SO4)3 + 3Ni} \)B. \( \ce{NaCl + AgNO3 -> AgCl + NaNO3} \)C. \( \ce{2NaOH + H2SO4 -> Na2SO4 + 2H2O} \)D. \( \ce{CaCO3 -> CaO + CO2} \)