MHT CET · Chemistry · Electrochemistry

Which of the following statements is NOT correct for \(\mathrm{H}_2-\mathrm{O}_2\) fuel cell?

A \(\mathrm{H}_{2(\mathrm{~g})}\) serves as fuel
B \(\mathrm{O}_{2(\mathrm{~g})}\) is an oxidising agent
C Platinum wires are used as anode and cathode
D Hot aqueous KOH solution acts as an electrolyte

Verified Solution

Answer & Solution

Correct Answer

(C) Platinum wires are used as anode and cathode

Step-by-step Solution

Detailed explanation

In an \(\mathrm{H}_2-\mathrm{O}_2\) fuel cell, the electrodes are typically porous carbon electrodes impregnated with catalysts like platinum, palladium, or nickel to facilitate the reactions.
The use of platinum wires as electrodes is not standard practice because:
Platinum is expensive, and using it as solid wires would not be cost-effective.
Porous electrodes increase the surface area for the reaction and improve efficiency.
Conclusion: This statement is NOT correct.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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