Q2. In the reaction \( \ce{2AgNO3 + H2S -> Ag2S + 2HNO3} \), which species is oxidized?A. \( \ce{H2S} \)B. \( \ce{AgNO3} \)C. \( \ce{Ag2S} \)D. \( \ce{HNO3} \)
Q3. In \( \ce{2KMnO4 + 16HCl -> 2MnCl2 + 5Cl2 + 2KCl + 8H2O} \), which species contains the element reduced?A. \( \ce{HCl} \)B. \( \ce{Cl2} \)C. \( \ce{MnCl2} \)D. \( \ce{KMnO4} \)
Q7. In \( \ce{PbS + 4H2O2 -> PbSO4 + 4H2O} \), which species is the reducing agent?A. \( \ce{H2O2} \)B. \( \ce{PbS} \)C. \( \ce{PbSO4} \)D. \( \ce{H2O} \)
Q8. Which reaction is an example of a combination redox reaction?A. \( \ce{CaO + H2O -> Ca(OH)2} \)B. \( \ce{S + O2 -> SO2} \)C. \( \ce{2NaCl -> 2Na + Cl2} \)D. \( \ce{NaOH + HCl -> NaCl + H2O} \)
Q10. In \( \ce{2Cr(OH)3 + 3H2O2 + 4NaOH -> 2Na2CrO4 + 8H2O} \), how many electrons are lost per chromium atom?A. 3B. 2C. 4D. 1