Refer to the Galvanic Cell Below (The Contents of Each $\to$

question 111

Multiple Choice

Refer to the galvanic cell below (the contents of each half-cell are written beneath each compartment) : 0.10 M MnO₄^- 0.40 M Cr³⁺
0.20 M Mn²⁺ 0.30 M Cr₂O₇^2-
0.010 M H⁺ 0.010 M H⁺
The standard reduction potentials are as follows:
MnO₄^- + 8H⁺ + 5e^- $\to$ Mn²⁺ + 4H₂O, $\varepsilon$ ^$\circ$ = 1.51 V
Cr₂O₇^2- + 14H⁺ + 6e^- $\to$ 2Cr³⁺ + 7H₂O, $\varepsilon$ ^$\circ$ =1.33 V
-When current is allowed to flow,which species is reduced?

• A)Cr₂O₇^2-
• B)Cr³⁺
• C)MnO₄^-
• D)Mn²⁺
• E)H⁺

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