Which statement is correct:
Correct answer: B. SHE may act as cathode or anode depending upon the reduction potential of the counterpart
- A. Standard Hydrogen Electrode SHE always acts as anode
- B. SHE may act as cathode or anode depending upon the reduction potential of the counterpart
- C. SHE always acts as cathode in voltaic cell
- D. None of the above
Explanation
SHE may act as cathode or anode depending upon the reduction potential of the counterpart: This statement is correct. The role of the SHE in a voltaic or electrolytic cell is determined by the reduction potential (also known as standard electrode potential) of the other electrode or species involved in the cell. The electrode with a higher reduction potential will act as the cathode, while the one with a lower reduction potential will act as the anode. The SHE can serve as either the cathode or the anode, depending on the specific conditions and the reduction potential of the counterpart. The correct statement is: SHE may act as cathode or anode depending upon the reduction potential of the counterpart.
This question appeared on the ETEA MDCAT 2009 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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