Q. 26

In the extraction of chlorine from brine _____________.
A. for the overall reaction is negative.

B. for the overall reaction is positive.

C. for overall reaction has negative value.

D. for overall reaction has positive value.

Answer :

The following reaction takes place during extraction of chlorine from brine

2Cl (aq) + 2H2O(l) 2OH (aq) + H2(g) + Cl2(g)


The for this reaction is +422kJmol-1. Using the formula


, = -nF


Where, is the Gibb’s free energy


n is the number of moles


F is Faraday’s constant


is the electrode potential


Putting the values in the above formula, we get


=- =-2.2V


Therefore, for the overall reaction is positive and for overall reaction has negative value.

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