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Identify the incorrect statement among t...

Identify the incorrect statement among the following ?

A

A salt bridge is used to eliminate liquid junction potential in a galvanic cell

B

The Gibbs free energy change , `DeltaG` is related with electromotive force (E), as `DeltaG=-nFE`

C

Nernst equation for single electrode potential is given by `E=E^@-(RT)/(nF)In[M^(n+)]`

D

The maximum theoretical efficiency of a hydrogen oxygen fuel cell is 33%

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question of identifying the incorrect statement among the provided options, we will analyze each statement one by one. ### Step 1: Analyze Option 1 **Statement:** A salt bridge is used to eliminate liquid junction potential in a galvanic cell. **Evaluation:** This statement is correct. A salt bridge is indeed used in galvanic cells to maintain electrical neutrality by allowing the flow of ions, which helps eliminate the liquid junction potential. ### Step 2: Analyze Option 2 **Statement:** The Gibbs free energy change (ΔG) is related to emf (electromotive force) as ΔG = -nFE. **Evaluation:** This statement is also correct. The relationship between Gibbs free energy change and electromotive force is given by the equation ΔG = -nFE, where n is the number of moles of electrons transferred, F is Faraday's constant, and E is the emf of the cell. ### Step 3: Analyze Option 3 **Statement:** The Nernst equation for a single electrode potential is given by E = E0 - (RT/nF) ln(n⁺). **Evaluation:** This statement is incorrect. The correct form of the Nernst equation for a single electrode potential is E = E0 + (RT/nF) ln([A]/[Mn⁺]), where [A] is the concentration of the species and [Mn⁺] is the concentration of the ions. The sign and the logarithmic base are important here. ### Step 4: Analyze Option 4 **Statement:** The maximum theoretical efficiency for hydrogen-oxygen fuel cells is 33%. **Evaluation:** This statement is correct. The maximum theoretical efficiency of hydrogen-oxygen fuel cells is indeed around 33%, which is a well-established fact in electrochemistry. ### Conclusion After evaluating all the statements, we find that the incorrect statement is **Option 3**. ### Final Answer The incorrect statement is **Option C**. ---
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