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VITEEE 2019 Paper

Section: Chemistry

Question : 72 of 125

Marks: +1, -0

In a hydrogen - oxygen fuel cell, combustion of hydrogen occurs to :

Solution:

In hydrogen-oxygen fuel cell, following reactions take place to create potential difference between the two electrodes.

\begin{array}{l} 2\mathrm{H}_2\text{(g)} + 4\mathrm{OH}^-\text{(aq)} \rightarrow 4\mathrm{H_2O}\text{(l)} + 4e^- \\ \mathrm{O}_2\text{(g)} + 2\mathrm{H_2O}\text{(l)} + 4e^- \rightarrow 4\mathrm{OH}^-\text{(aq)} \end{array}

Overall reaction

= 2\mathrm{H}_2\text{(g)} + \mathrm{O}_2\text{(g)} \rightarrow 2\mathrm{H_2O}\text{(l)}

the net reaction is the same as burning (combustion) of hydrogen to form water.

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