Question

What is the Standard cell potential of a cell constituted by two electrodes, A \((E_{\text{A}^{+}/\text{A}}^{0}=0.30\ \text{V})\) and B \((E_{\text{B}^{+}/\text{B}}^{0}=+0.42\ \text{V})\) ?

• A. \(0.12\ \text{V}\)
• B. \(0.30\ \text{V}\)
• C. \(0.42\ \text{V}\)
• D. \(0.72\ \text{V}\)

Hint:

Subtract the lower reduction potential from the higher one.

Answer 1

The Correct Option is A

Step 1: Understanding the Concept
\(E^{\circ}_{cell} = E^{\circ}_{cathode} - E^{\circ}_{anode}\). The electrode with the higher reduction potential is the cathode.

Step 2: Identify the electrodes
B has \(+0.42\ \text{V}\), so it is the cathode. A has \(0.30\ \text{V}\), so it is the anode.

Step 3: Calculation
\(E^{\circ}_{cell} = 0.42 - 0.30 = 0.12\ \text{V}\).

Final Answer:
The standard cell potential is 0.12 V. \[ \boxed{\text{(A) }0.12\ \text{V}} \]