A) Produce high purity water
B) Create potential difference between the two electrodes
C) Generate heat
D) Remove adsorbed oxygen from electrode surfaces
Correct Answer: B
Solution :
In hydrogen?oxygen fuel cell following reactions take place to create potential difference between two electrodes. \[2{{H}_{2}}_{(g)}+4O{{H}^{-}}_{(aq)}\to 4{{H}_{2}}{{O}_{(l)}}+4{{e}^{-}}\] \[{{O}_{2}}_{(g)}+2{{H}_{2}}{{O}_{(l)}}+4{{e}^{-}}\to 4O{{H}^{-}}_{(aq)}\] Overall reaction =\[2{{H}_{2}}_{(g)}+{{O}_{2(g)}}\to 2{{H}_{2}}{{O}_{(l)}}\] the net reaction is the same as burning (Combustion) of hydrogen to form water.
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