Four half reactions I to IV are shown below: I. 2 {Cl}^{-} ...

CBSE Class 12 Chemistry 2023 Delhi Set 1 Solved Paper

Question : 4

Total: 35

Four half reactions I to IV are shown below:
I. 2Cl−→Cl2+2e−
II. 4OH−→O2+2H2O+2e−
III. Na++e−→Na
IV. 2H++2e−→H2
Which two of these reactions are most likely to occur when concentrated brine is electrolysed?

I and III
I and IV
II and III
II and IV

Solution: 👈: Video Solution

Explanation:
At anode 2Cl−→Cl2+2e−
(2) At cathode
Na++e−→Na=Eo=−2.71V
2H++2e−→H2,Eo=0~V
Those have high Eo value, that reaction will take place.

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