1.

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

Answer»

`Cd_((s)) + 2NI(OH)_(3(s)) to CdO_((s)) + 2Ni (OH) + H_2O_((l))`
`Pb_((s)) + PbO_(2(s)) + 2H_2SO_(4(aq)) to 2PbSO_(4(s)) + 2H_2O_((l))`
`2Fe_((s)) + O_(2(g)) to 2H_2O_((l))`
`2Fe_((s)) + O_(2(g)) + 4H_((aq))^(+) to 2Fe_((aq))^(2+) + 2H_2O_((l))`

Answer :C


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