Which electrolyte is used in an alkali fuel cell? a high-temperature carbonate salt mixture a solid polymer a solid ceramic metal oxide compound an aqueous potassium hydroxide solution

Option D: An aqueous potassium hydroxide solution.

An electrolyte is defined as a solution with property of  electrical conductivity.

In an alkaline fuel cell, as the name suggests the electrolyte used is an alkaline liquid. Potassium hydroxide solution is an alkaline solution with chemical formula KOH. In aqueous solution, it exists in ionic form as and ions. Due to the movement of hydroxide ion across the electrolyte, electrical energy can be extracted.

Therefore, electrolyte used in the alkaline fuel cell is aqueous solution of potassium hydroxide.

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