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Question
In the extraction of chlorine by electrolysis of brine ______.
Options
oxidation of Cl– ion to chlorine gas occurs.
reduction of Cl– ion to chlorine gas occurs.
for overall reaction ∆GΘ has negative value.
a displacement reaction takes place.
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Solution
In the extraction of chlorine by electrolysis of brine for overall reaction ∆GΘ has negative value.
Explanation:
Extraction of chlorine from brine is based on the oxidation reaction of Cl– ion.
\[\ce{2H2O (l) + 2Cl^{-} (aq) -> 2OH^{-} (aq) + H2 (g) + Cl2 (g)}\]
The ∆GΘ for this reaction us + 422 kJ.
∆GΘ = – nFEΘ
EΘ = `- (∆G^Θ)/(nF)`
= – 2.2 V
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