Quiz-Redox-2

1. Which of the following is the strongest oxidizing agent?A.Cu2+ B.Pb2+ C.Ni2+ D.Sn2

2. Consider the reaction: MnO4- + 5Fe2+ + 8H+ _ Mn2+ + 5Fe3+ + 4H2ODuring the reaction, electrons transfer fromA.Fe3+ to Fe2+ B.Fe2+ to MnO4 - C.MnO4 - to Fe2+ D.MnO4- to Mn2+

3. As an element is oxidized, its oxidation numberA.increases as electrons are lost B.decreases as electrons are lostC.increases as electrons are gained D.decreases as electrons are gained

4. A substance is oxidized when itA.loses protons B.gains protons C.loses electrons D.gains electrons

5. The species which gains electrons in a redox reactionA.loses mass B.is oxidized C.is the oxidizing agent D.increases in oxidization number

6. The oxidizing agents from the strongest to the weakest areA.V2+, U3+, Y3+ B.U3+, V2+, Y3+ C.Y3+, U3+, V2+ D.V2+, Y3+, U3+

7. When NO2 reacts to form N2O4 the oxidation number of nitrogenA.increases by 2 B.increases by 4 C.increases by 8 D.does not change

8. The oxidation number of nitrogen increases inA.NO3- _ NO B.N2O4 _ NI3 C.NH3 _ NH4+ D.NO2 _ N2O5

9. Which of the following represents a balanced reduction half-reaction?A.VO2 + 2H+ + 2e- _ V2+ + H2O B.VO2 + H2 _ V2+ + H2O + le-C. VO2 + 2H+ + le- _ V2+ + H2O D.VO2 + 4H+ + 2e- _ V2+ + 2H2O

10. In the following half reaction: Sb2O3 + 6H+ + 6e- _ 2Sb + 3H2OThe oxidation number of antimony in Sb2O3A.increases by 3 B.increases by 6 C.decreases by 3 D.decreases by 6

11. The oxidation number of platinum in Pt(H2O)42+ isA.+2 B.0 C.+4 D. +1/2

12. Hydrogen has an oxidation number of –1 inA. H2 B. NaH C. H2O D. KOH

13.Consider the following redox reaction: 6H+ + 6I- + ClO3- _ 3I2 + 3H2O + Cl-The reducing agent isA. I- B. I2 C. H+ D. ClO3

14. Which equation represents a redox reaction?A.Pb2+ + 2Cl- _ PbCl2 B.CaO + CO2 _ CaCO3C.Mg + 2HCl _ MgCl2 + H2 D.HCl + NaOH _ NaCl + H2O