The calomel electrode is reversible with respect to:
Correct answer: D. Cl-
- A. Mercury
- B. H+
- C. Hg+2
- D. Cl-
Explanation
The correct answer is that the calomel electrode is reversible with respect to chloride ions (Cl-). In the calomel electrode, the key reversible reaction is:Hg2Cl2(s) ⇌ 2Hg + 2Cl-This reaction shows that the electrode's functionality depends on the presence of chloride ions, which participate in the reversible conversion between mercury(I) chloride and elemental mercury. This reversibility is what makes it a reliable reference electrode in electrochemical measurements.Other options such as mercury, H+, and Hg+2 are incorrect because they do not participate in the reversible reaction specific to the calomel electrode.
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