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  • Brine is electrolysed by using inert electrodes. The reaction at anode is ________. (i) Cl^{-}(aq.)\rightarrow \frac{1}{2}Cl_{2}(g)+e^{-};E^{o}cell=1.36 V

Brine is electrolysed by using inert electrodes. The reaction at anode is ________.

(i) Cl^{-}(aq.)\rightarrow \frac{1}{2}Cl_{2}(g)+e^{-};E^{o}cell=1.36 \; V

(ii) 2H_{2}O(l)\rightarrow O_{2}(g)+4H^{+}+4e^{-};E^{o}cell=1.23 \; V

(iii) Na^{+}(aq)+e^{-}\rightarrow Na (s);E^{0}cell=2.71\; V

(iv) H^{+}(aq)+e^{-}\rightarrow \frac{1}{2}H_{2} (g);E^{0}cell=0.00\; V

Answers (1)

The answer is the option (i). Electrolysis of brine solution is a process of decomposition of NaCl solution using the electric current. Anode is positive; therefore it attracts negative hydroxide and chlorine ions. Chloride ions get oxidized by electron loss to chlorine molecules.

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