The order of ease of reduction of H+1, Cu+2 and Ag+1:
Correct answer: C. Ag+ > Cu+2 > H+1
- A. H+1 > Cu+2 > Ag+
- B. H+1 > Ag+ > Cu+2
- C. Ag+ > Cu+2 > H+1
- D. H+1 > Cu+2 > Ag+
Explanation
The more positive the standard electrode potential, the more readily the ion accepts electrons, and the values are plus 0.80 V for silver, plus 0.34 V for copper and zero for hydrogen by definition. Silver is therefore reduced most easily and hydrogen least, which is also why copper and silver do not displace hydrogen from dilute acids. Note that options (a) and (d) were printed identically in the original paper.
This question appeared on the UHS MDCAT 2025 paper, which you can sit online with every answer explained.
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About Standard Hydrogen Electrode
The standard hydrogen electrode provides the reference potential of 0.00 V for measuring electrode potentials. It consists of platinum in contact with hydrogen gas at standard pressure and hydrogen ions at standard concentration, usually at 25°C, and can operate as either the oxidation or reduction half-cell.
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