1.

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

Answer»

`Cd_((s))+2Ni(OH)_(3(s))toCdO_((s))+2Ni(OH)+H_(2)O_((L))`
`Pb_((s))+PbO_(2(s))+2H_(2)SO_(4(aq))to2PbSO_(4(s))+2H_(2)O_((l))`
`2H_(2(g))+O_(2(g))to2H_(2)O_((l))`
`2Fe_((s))+O_(2(g))+4H_((aq))^(+)to2Fe_((aq))^(2+)+2H_(2)O_((l))`

SOLUTION :Overall reaction `-2H_(2(g))+O_(2(g))to2H_(2)O_((l))`


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