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StuDocu is not sponsored or endorsed by any college or university Multiple choice complete with answers at the end Chemistry (Politecnico di Torino) Downloaded by MAHDI NAJARAINDARZI ([email protected]) lOMoARcPSD|11532631

6. Which one of the following is not a redox reaction? A) Al(OH)4 - (aq) + 4H+ (aq)  Al3+(aq) + 4H2O(l) B) C6H12O6(s) + 6O2(g)  6CO2(g) + 6H2O(l) C) Na6FeCl8(s) + 2Na(l)  8NaCl(s) + Fe(s) D) 2H2O2(aq)  2H2O(l) + O2(g) E) CO2(g) + H2(g)  CO(g) + H2O(g) 7. Consider the reaction CuO(s) + H2(g)  Cu(s) + H2O(l) In this reaction, which substances are the oxidant and reductant, respectively? A) CuO and H2 B) H2 and CuO C) CuO and Cu D) H2O and H2 E) None of these choices is correct. 8. Consider the following balanced redox reaction Mn2+(aq) + S2O8 2-(aq) + 2H2O(l)  MnO2(s) + 4H+ (aq) + 2SO4 2-(aq) Which of the following statements is true? A) Mn2+(aq) is the oxidizing agent and is reduced. B) Mn2+(aq) is the oxidizing agent and is oxidized. C) Mn2+(aq) is the reducing agent and is oxidized. D) Mn2+(aq) is the reducing agent and is reduced. E) Manganese does not change its oxidation number in this reaction. 9. Which of the following statements about voltaic and electrolytic cells is correct? A) The electrons in the external wire flow from cathode to anode in both types of cell. B) Oxidation occurs at the cathode only in a voltaic cell. C) The free energy change, G, is negative for an electrolytic cell. D) The cathode is labeled as positive (+) in a voltaic cell but negative (-) in an electrolytic cell. E) Reduction occurs at the anode in an electrolytic cell. 10. Which of the following statements about voltaic and electrolytic cells is correct? A) The anode will definitely gain weight in a voltaic cell. B) Oxidation occurs at the cathode of both cells. C) The free energy change, G, is negative for the voltaic cell. D) The electrons in the external wire flow from cathode to anode in an electrolytic cell. E) None of these statements is correct. Page 2 Downloaded by MAHDI NAJARAINDARZI ([email protected]) lOMoARcPSD|11532631