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Which electrolyte is used in a high-temperature fuel cell using coal?

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Which electrolyte is used in a high-temperature fuel cell using coal?

(a) MgCO3

(b) Fused K2CO3

(c) CaCO3

(d) Fused Na2CO3

I have been asked this question in an interview.

This intriguing question comes from Inorganic Chemical topic in chapter Inorganic Chemical Industries of Chemical Technology

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The correct answer is (b) Fused K2CO3

Easiest explanation: Fused K2CO3 is used as electrolyte in high temperature fuel cell using coal. Coal volatiles are sent into a high temperature fused K2CO3 electrolyte fuel cell from retort.

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