Q10 / 150 · MHT CET 2026 (17 April Shift 1) · Chemistry
Which of the following hot aqueous solutions is used to dip carbon rods of $\text{H}_2 - \text{O}_2$ fuel cell ?
- A$\text{KCl}$
- Correct answerB$\text{KOH}$
- C$\text{H}_2\text{SO}_4$
- D$\text{NH}_4\text{Cl}$
Solution
In a hydrogen-oxygen fuel cell, the electrolyte used is a hot concentrated aqueous solution of potassium hydroxide ($\text{KOH}$) or sodium hydroxide ($\text{NaOH}$).
The porous carbon electrodes, which are impregnated with a suitable catalyst like platinum or palladium, are dipped in this hot aqueous solution of $\text{KOH}$ to facilitate the flow of ions between the electrodes.
Answer: $\text{KOH}$
The porous carbon electrodes, which are impregnated with a suitable catalyst like platinum or palladium, are dipped in this hot aqueous solution of $\text{KOH}$ to facilitate the flow of ions between the electrodes.
Answer: $\text{KOH}$
Hence, the correct answer is option: 'B'.