Question

In the extraction of chlorine from brine:

(i) ∆G^Θ for the overall reaction is negative.

(ii) ∆G^Θ for the overall reaction is positive.

(iii) E^Θ for overall reaction has negative value.

(iv) E^Θ for overall reaction has positive value.

Answer 1

(ii) ∆G^Θ for the overall reaction is positive.

(iii) E^Θ for overall reaction has negative value.

Explanation:

\[\ce{3Cl^{-} + 2H2O -> 2OH^{-} + H2 + Cl2}\]

∆G^Θ for the reaction is + 422 kJ.

Using ∆G^Θ = – nFE^Θ, we ger E^Θ = – 2.2 V