AP QUIZZES - AP TOPIC 16 Electrochemistry SET B
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QUESTION 1. Dichromate (VI) ions in acid solution can be used as oxidizing agents. In the reduction half-reaction they are converted to Chromium (III) ions. When the half-reaction is balanced using the lowest possible integers, what is the sum of the coefficients?

(A) 30
(B) 29
(C) 28
(D) 24
(E) None of the Above

QUESTION 2. Manganate (VII) ions in acid solution can be used as oxidizing agents. In the reduction half-reaction they are converted to Manganese (II) ions. When the half-reaction is balanced using the lowest possible integers, what is the sum of the coefficients?

(A) 19
(B) 18
(C) 17
(D) 14
(E) None of the above

QUESTION 3. If the two half-cells below were combined under non-standard conditions, what would the value of n be in the Nernst equation?

Cu2+ + 2e- <====> Cu (+0.34V)
Ag+ + e- <====> Ag (+0.80V)


(A) 0
(B) 1
(C) 2
(D) 3
(E) 4

QUESTION 4. The following REDOX reactions all have positive Ecell voltages.

Cl2 + 2Br- ==> Br2 + 2Cl-
Br2 + 2I- ==> I2 + 2Br-
Cl2 + 2I- ==> I2 + 2Cl-

Which is the correct order of strength of oxidizing agent, from weakest to strongest?


(A) Chlorine < Iodine < Bromine
(B) Bromine < Chlorine < Iodine
(C) Iodine < Bromine < Chlorine
(D) Chlorine < Bromine < Iodine
(E) Iodine < Chlorine < Bromine

QUESTION 5. The standard reduction potential for Zn2+ + 2e- ==> Zn, is -0.76 V, and the standard reduction potential for Fe3+ + e- ==> Fe2+, is +0.77V. What is the Ecell for the reaction below?

2Fe3+ + Zn ==> Zn2+ + 2Fe2+


(A) +2.30V
(B) +1.53V
(C) -2.30V
(D) -1.53V
(E) -0.75V




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