Q2. In the reaction \( \ce{5H2S + 2KMnO4 + 3H2SO4 -> 5S + 2MnSO4 + 8H2O + K2SO4} \), which element is oxidized?A. ManganeseB. OxygenC. SulfurD. Hydrogen
Q3. In the reaction \( \ce{Cl2 + 2KBr -> 2KCl + Br2} \), which element is oxidized?A. BromineB. ChlorineC. PotassiumD. None of these
Q4. Which reaction does not involve a redox process?A. \( \ce{2Na + 2H2O -> 2NaOH + H2} \)B. \( \ce{Fe + 2HCl -> FeCl2 + H2} \)C. \( \ce{MgSO4 + 2NaOH -> Mg(OH)2 + Na2SO4} \)D. \( \ce{2H2O2 -> 2H2O + O2} \)
Q5. In the reaction \( \ce{PbS + 4H2O2 -> PbSO4 + 4H2O} \), which element is reduced?A. LeadB. OxygenC. SulfurD. Hydrogen
Q6. Which of the following reactions shows the gain of electrons by a species, indicating reduction?A. \( \ce{2FeCl3 + SnCl2 -> 2FeCl2 + SnCl4} \)B. \( \ce{2Na + O2 -> Na2O2} \)C. \( \ce{H2S + I2 -> 2HI + S} \)D. \( \ce{2NH3 -> N2 + 3H2} \)
Q8. In which compound does oxygen have an oxidation number of +2?A. \( \ce{H2O} \)B. \( \ce{H2O2} \)C. \( \ce{OF2} \)D. \( \ce{KO2} \)
Q9. In the reaction \( \ce{H2S + Cl2 -> 2HCl + S} \), which element is oxidized?A. SulfurB. ChlorineC. HydrogenD. None of these
Q10. Which of the following reactions demonstrates the removal of hydrogen, indicating an oxidation process?A. \( \ce{2H2S + O2 -> 2S + 2H2O} \)B. \( \ce{H2 + Cl2 -> 2HCl} \)C. \( \ce{2Na + 2H2O -> 2NaOH + H2} \)D. \( \ce{Fe + H2SO4 -> FeSO4 + H2} \)