A) \[Zn(Hg)+2O{{H}^{-}}\xrightarrow{{}}ZnO(s)+{{H}_{2}}O+2{{e}^{-}}\]
B) \[Pb(s)+SO_{4}^{2-}(aq)\xrightarrow{{}}PbS{{O}_{4}}(s)+2{{e}^{-}}\]
C) \[2{{H}_{2}}(g)+4O{{H}^{-}}(aq)\xrightarrow{{}}4{{H}_{2}}O(l)+4{{e}^{-}}\]
D)
Correct Answer: C
Solution :
Anode reaction for a fuel cell (cell that converts the chemical energy of a fuel directiy into electrical energy) is \[2{{H}_{2}}(g)+4O{{H}^{-}}(aq)\xrightarrow{{}}4{{H}_{2}}O(l)+4{{e}^{-}}\] \[2Fe(s)\xrightarrow{{}}2F{{e}^{2+}}+4{{e}^{-}}\]
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