c. 0.52 Vd 1.02 V e.none of t A voltaic cell that uses the reaction, TI3+(aq) 2

Question

c. 0.52 Vd 1.02 V e.none of t A voltaic cell that uses the reaction, TI3+(aq) 2 Cr2+(aq) + Tr(aq) 2 Cr3+(aq) ? + has a measured standard cell potential of +1.19 V. What is the E' red for the II' (ag)? for the reduction of T'( 0.77V b 1.61 Vc e none of the c. 0.45 V d. 1.93V 19. Which is the strongest reducing agent? a. Cl2(g) c. e. ZnCl2(?) b. H2() in acid soln Kl(ag) Zn(s) ? Which is the strongest oxidizing agent? C2cid so 20. e. ZnCl2(a) c. Kl(aq) d. Zns) b. H2(g) in acid soln 21. Aqueous Cu? can oxidize all of the following except e. Mg(s) c. Cr(s) d. Fe2+ b. Zn(s) a. Cr2 V at 25 °c 16H'(aq) 22. For the reaction below, E 8H20? e. 8.37 2 Mn2+(aq) + SBr2O + (aq) + 10 Br(w" ? a. -2.33 c. 0.44 d. 2.58 What is the potential of this cell at 25 °C? a. 1.10 V When the following half-reaction in acid soluti 23. Zn(o)lZn? (aq, 0.35 M)llCu?'(aq, 4.7 x 10s M)lc 121 V 0.99 v 24. is balanced with the lowest whole-numbered coefficients, the coefficient of H+ will be, Cr20 (ag)(ag) 14 21 d. 8 C. e. none of these 25. When the following halfreaction in S2(aq) coefficients, the coefficient of Off will blanced with the lowest whole-numbered SO42-(aq) half-reaction in basic solution is the lowest whole-numbered ? e. none of thes a. d.

Explanation / Answer

Ans 22

The two half cell reactions are

Reduction reaction

MnO4- + 8H+ + 5e- = Mn2+ + 4H2O

Multiply by 2

2MnO4- + 16H+ + 10e- = 2Mn2+ + 8H2O

Ered = 1.51 V

Oxidation reaction

2Br- = Br2 + 2e-

Multiply by 5

10Br- = 5Br2 + 10e-

Eox = - 1.07 V

Overall cell reaction

2MnO4- + 16H+ + 10Br- = 5Br2 + 2Mn2+ + 8H2O

E°cell = Eox + Ered

= - 1.07 + 1.51

= 0.44 V

Option C is the correct answer

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