Two half cells have reduction potentials − 0.76 V and −0.13 V respectively. A galvanic cell is made from these two half cells. Which of the following statements is correct?
Correct answer: B. Electrode of half-cell potential − 0.76 V serve as anode
- A. Electrode of half-cell potential − 0.76 V serves as cathode
- B. Electrode of half-cell potential − 0.76 V serve as anode
- C. Electrode of half-cell potential − 0.13 V serves as anode
- D. Electrode of half-cell potential − 0.76 V serves as positive electrode and -0.13 V as negative electrode
Explanation
In a galvanic cell, the electrode with the more negative reduction potential functions as the anode, where oxidation occurs. Here, the electrode with a reduction potential of −0.76 V serves as the anode, while the electrode with a reduction potential of −0.13 V serves as the cathode, where reduction takes place. The standard cell potential is calculated as the difference between the cathode and anode potentials, resulting in +0.63 V, indicating a spontaneous reaction. Options A, C, and D are incorrect because they misidentify the electrodes' roles in the galvanic cell.
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