Which correctly distinguishes voltaic cell from an electrolytic cell? In the red

Question

Which correctly distinguishes voltaic cell from an electrolytic cell? In the redox reaction 2MnO_4^- (aq) + 16H^+ (aq) + 5 Sn^2+ (aq) rightarrow 2 Mn^2+ (aq) + 8 H_2 O(l) + 5 Sn^4+ (aq) the oxidation number of manganese changes from ___ to ___. (A) +7, +2 (B) +2, +4 (C) -1, +4 (D) -1, +2 Consider a galvanic cell based on the half reactions: Cu^2+ + 2e^- rightarrow Cu E degree = 0.34 V Cr^3+ + 3e^- rightarrow Cr E degree = -0.74 V What is the anode reaction? (A) Cu^3+ (aq) + 3e^- rightarrow Cu (s) (B) Cu^3+ (aq) + 2e^- rightarrow Cu (s) (C) Cr (s) rightarrow Cr^3+ (aq) + 3^e- (D) Cu (s) rightarrow Cu^2+ (aq) + 2^e- The purpose of a salt bridge in a galvanic cell is to (A) correct any volume changes in the cell. (B) maintain charge balance in the cell (C) provide ions to be oxidized and reduced. (D) provide a path for the flow of free electrons. If an aqueous solution of sodium iodide is electrolyzed, what are the principal products found at the cathode and anode, respectively? (A) H_2 and OH^-: I_2 (B) Na: I_2 (C) H_2 and OH^-: O_2 and H^+ (D) Na: O_2 and H^+ Given these half reactions Cs* + e^- rightarrow Cs E degree = -3.026 V F_2 + 2e^- rightarrow 2F^- E degree = 2.866 V what is the standard potential in volts for the reaction 2Cs + F_2 rightarrow 2 CsF (A) +8.898 (B) +5.892 (C) -0.160 (D) -5.892

Explanation / Answer

56) Option D

Delta G is graeter than zero for electrolytic cell

57) Option A

From +7 to +2

The oxidation number of MnO-4 is

x + 4*(-2) = -1

x = +7

The oxidation number of Mn2+ is +2

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