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.

Answer :

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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