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MHT CET202617 April 2026Morning ShiftChemistryElectrochemistryActual

Which of the following hot aqueous solutions is used to dip carbon rods of H ₂ - O ₂ fuel cell ?

Options

  1. AKCl
  2. BKOH
  3. CH ₂ SO ₄
  4. DNH ₄ Cl

Correct 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

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