Question
Which of the following hot aqueous solutions is used to dip carbon rods of H _2 - O _2 fuel cell ?
MHT CET
Chemistry
Electrochemistry
2026
MHT CET 2026 (17 April Shift 1)
MHT CET Chemistry Question (2026) — Solution
Options
- A. KCl
- B. KOH
- C. H _2 SO _4
- D. NH _4 Cl
Answer
B. KOH
Step-by-step solution
In a hydrogen-oxygen fuel cell, the electrolyte used is a hot concentrated aqueous solution of potassium hydroxide ( KOH ) or sodium hydroxide ( NaOH ). The porous carbon electrodes, which are impregnated with a suitable catalyst like platinum or palladium, are dipped in this hot aqueous solution of KOH to facilitate the flow of ions between the electrodes. Answer: KOH
Related: Chemistry — Electrochemistry · All PYQ Banks