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CBSE Class 12 Chemistry 2023 All Sets Solved Paper

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Question : 4 of 18
Marks: +1, -0
Four half reactions I to IV are shown below:
I. 2Cl−→Cl2+2e−2\mathrm{Cl}^- \rightarrow \mathrm{Cl}_2 + 2\mathrm{e}^-
II. 4OH−→O2+2H2O+2e−4\mathrm{OH}^- \rightarrow \mathrm{O}_2 + 2\mathrm{H}_2\mathrm{O} + 2\mathrm{e}^-
III. Na++e−→Na\mathrm{Na}^+ + \mathrm{e}^- \rightarrow \mathrm{Na}
IV. 2H++2e−→H22\mathrm{H}^+ + 2\mathrm{e}^- \rightarrow \mathrm{H}_2
Which two of these reactions are most likely to occur when concentrated brine is electrolysed?
Solution:  
On electrolysis of brine solution.
At anode 2Cl−→Cl2+2e−2\mathrm{Cl}^- \rightarrow \mathrm{Cl}_2 + 2\mathrm{e}^- (oxidation)
At cathode Na++e−→Na\mathrm{Na}^+ + \mathrm{e}^- \rightarrow \mathrm{Na}
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