A standard galvanic cell is constructed in which a Cu^2+ | Cu^+ half cell acts as the cathode Which of the following statements are correct? (Choose all that apply)
A. Cr^3+|Cr could be the other standard half cell.
B. As the cell runs, anions will migrate from the other compartment to the Cu^2+|Cu^+ compartment.
C. I_2|I^- could be the other standard half cell.
D. Cu^+ is oxidized at the cathode.
E. In the external circuit, elections flow from the other compartment to the Cu^2+|Cu^+ compartment

E. In the external circuit, elections flow from the other compartment to the Cu^2+|Cu^+ compartment

Explanation:

In a galvanic cell, electrons flow from anode to cathode. We must remember that oxidation occurs at the anode and reduction occurs at the cathode. Hence the process; M(s) > M^+(aq) + e occurs at the anode.

The electrons lost at the anode are conveyed to the cathode where they are accepted by other chemical species and are reduced to the corresponding reduced species according to the reaction; M^+(aq) + e > M(s)

Hence the Cu^2+ | Cu^+ half cell, being the cathode accepts electrons from the other half cell for this reduction reaction to take place, hence the answer

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your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.