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ICSE Class 10 Chemistry 2018 Paper

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Name the gas that is produced in each of the following cases :
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Question : 33 of 80
Marks: +1, -0
At the anode during the electrolysis of acidified water.
Solution:  
Oxygen
OH−−1e−  →OH\mathrm{OH}^{-} - 1 \mathrm{e}^{-} \;\rightarrow \mathrm{OH}
4OH  →2H2O+O2↑4 \mathrm{OH} \;\rightarrow 2 \mathrm{H}_2 \mathrm{O} + \mathrm{O}_2 \uparrow
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