A) \[{{O}_{2(g)}}+2{{H}_{2}}{{O}_{(l)}}+4{{e}^{-}}\xrightarrow{{}}4OH_{(aq)}^{-}\]
B) \[H_{(aq)}^{+}+OH_{(aq)}^{-}\xrightarrow{{}}{{H}_{2}}{{O}_{(l)}}\]
C) \[2{{H}_{2(g)}}+{{O}_{2(g)}}\xrightarrow{{}}2{{H}_{2}}{{O}_{(l)}}\]
D) \[{{H}^{+}}+{{e}^{-}}\xrightarrow{{}}\frac{1}{2}{{H}_{2}}\]
Correct Answer: A
Solution :
: The reactions occurring in H2-02 fuel cell Are \[\underset{\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_}{\mathop{\underset{Overn:\,all\,\,reactio\,\,2{{H}_{2(g)}}+{{O}_{2(g)}}\xrightarrow{{}}2{{H}_{2}}{{O}_{(l)}}}{\mathop{\underset{\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_}{\mathop{\begin{matrix} At\,\,anode:\,\,\,\,\,2{{H}_{2(g)}}+4OH_{(aq)}^{-}\xrightarrow{{}}4{{H}_{2}}{{O}_{(l)}}+4{{e}^{-}} \\ At\,cathode:\,\,\,{{O}_{2(g)}}+2{{H}_{2}}{{O}_{(l)}}+4{{e}^{-}}\xrightarrow{{}}4OH_{(aq)}^{-} \\ \end{matrix}}}\,}}\,}}\,\]
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