Q123 / 200 · MHT CET - Medical 2026 (24 April Shift 2) · Chemistry
What is the Standard cell potential of a cell constituted by two electrodes, A $(E^0_{\text{A}^+/\text{A}} = 0.30\ \text{V})$ and B $(E^0_{\text{B}^+/\text{B}} = +0.42\ \text{V})$ ?
- Correct answerA$0.12\ \text{V}$
- B$0.30\ \text{V}$
- C$0.42\ \text{V}$
- D$0.72\ \text{V}$
Solution
The standard reduction potential of electrode B is higher than that of electrode A. Thus, electrode B acts as the cathode and electrode A acts as the anode.
The standard cell potential is given by:
$E^0_{\text{cell}} = E^0_{\text{cathode}} - E^0_{\text{anode}}$
Substituting the given values:
$E^0_{\text{cell}} = 0.42\ \text{V} - 0.30\ \text{V} = 0.12\ \text{V}$
Answer: $0.12\ \text{V}$
The standard cell potential is given by:
$E^0_{\text{cell}} = E^0_{\text{cathode}} - E^0_{\text{anode}}$
Substituting the given values:
$E^0_{\text{cell}} = 0.42\ \text{V} - 0.30\ \text{V} = 0.12\ \text{V}$
Answer: $0.12\ \text{V}$
Hence, the correct answer is option: 'A'.