Q. 14.3( 4 Votes )
In the extraction of chlorine by electrolysis of brine ____________.
A. oxidation of Cl– ion to chlorine gas occurs.
B. reduction of Cl– ion to chlorine gas occurs.
C. For overall reaction has negative value.
D. a displacement reaction takes place.
The following reaction takes place during electrolysis of brine
2Cl– (aq) + 2H2O(l) → 2OH– (aq) + H2(g) + Cl2(g)
Here, chloride ionsgets oxidised to chlorine gas.
Thus, oxidation occurs and not reduction, hence option (ii) is incorrect. It is a redox reaction and not a displacement reaction,so option (iv) is also incorrect.
The ∆G° of this reaction is +422kJ which is a positive value so option (iii) is incorrect as well.
Therefore, option (i) is the correct option.
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