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(B) During the electrolysis of concentrated aqueous $NaCl$ (brine),the following reactions occur:At the cathode: $2H_2O(l) + 2e^- \rightarrow H_2(g) +

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turns red litmus into blue

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(B) During the electrolysis of concentrated aqueous $NaCl$ (brine),the following reactions occur:At the cathode: $2H_2O(l) + 2e^- \rightarrow H_2(g) + 2OH^-(aq)$At the anode: $2Cl^-(aq) \rightarrow Cl_2(g) + 2e^-$The net reaction is: $2NaCl(aq) + 2H_2O(l) \rightarrow 2NaOH(aq) + Cl_2(g) + H_2(g)$Since $NaOH$ is a strong base,the resulting solution is basic in nature.Therefore,it turns red litmus into blue.

The resulting solution obtained at the end of electrolysis of concentrated aqueous solution of $NaCl$ . . . . . . .

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