Which of the following reaction is react...

Which of the following reaction is reaction is used to make a fuel cell .

`Cd(s)+NiO_(2)(s)+2H_(2)O(l) to Cd(OH)_(2)(s)+Ni(OH)_(2)(s)`

`Pb(s)+PbO_(2)(s)+2H_(2)SO_(4)(aq) to 2PbSO_(4)(s)+2H_(2)O(l)`

`2H_(2)(g)+O_(2)(g) to 2H_(2)O(l)`

`2Fe(s)+O_(2)(g)+4H^(+)(aq) to 2Fe^(2+)(aq)+2H_(2)O(l)`

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The correct Answer is:

(c ) is the correct answer.

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