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The cell reaction of a fuel cell is...

The cell reaction of a fuel cell is

A

`2H_(2)+O_(2)rarr2H_(2)O(l)`

B

`H^(+)+OH^(-)rarrH_(2)O`

C

`O_(2)+2H_(2)O+4e^(-)rarr4OH^(-)`

D

`H^(+)+e^(-)rarr1//2H_(2)`.

Text Solution

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The correct Answer is:
C
For details see review (already discussed there)
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Fuel cells : Fuel cells are galvanic cells in which the chemical energy of fuel cell is directly converted into electrical energy. A type of fuel cell is a hydrogen - oxygen fuel cell. It consists of two electrodes made up of two porous graphite impregnated with a catalyst ( platinum, silver, or metal oxide ). The electrodes are placed in aqueous solution of NaOH . Oxygen and hydrogen are continuously fed into the cell. Hydrogen gets oxidized to H^(o+) which is neutralized by overset(c-)(O)H, i.e., anodic reaction. At cathode, O_(2) gets reduced to overset(c-)(O)H Hence, the net reaction is The overall reaction has DeltaH=-285.6 kJ mol^(-1) and DeltaG=-237.4 kJ mol^(-1) at 25^(@)C What is the value of DeltaS^(c-) for the fuel cell at 25^(@)C ?

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