Refer to the galvanic cell below (the contents of each half-cell are written beneath each compartment). The standard reduction potentials are as follows:
-When current is allowed to flow, which species is oxidized?

Question

Refer to the galvanic cell below (the contents of each half-cell are written beneath each compartment).  The standard reduction potentials are as follows: 
-When current is allowed to flow, which species is oxidized?

Quizplus · Accepted Answer

In the given galvanic cell, Cr has a higher reduction potential than MnO and H+, therefore it will be reduced at the cathode. The only option with Cr is option B, where it is present as Cr3+. Thus, the species oxidized must be in the anode compartment. Mn and H+ are both present in the anode compartment in options A and E, but they are not together. Option C contains MnO, which has a lower reduction potential than Mn2+ present in option A, so it cannot be oxidized. Option D contains multiple species including Cr, Mn, and H+, but the oxidation potential cannot be determined without further information. Therefore, the best choice is B as it contains the only possible species (Cr3+) that can be reduced at the cathode.

Refer to the Galvanic Cell Below (The Contents of Each