InterviewSolution
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InterviewSolution
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When a solution of NaCl containing `C_(2)H_(5)OH` is electrolysed it forms :A. `C Cl_(4)`B. `CHI_(3)`C. `CH_(2)Br_(2)`D. `C_(2)H_(5)OH` |
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Answer» Correct Answer - B Chloroform is manufactured by electrolysis of an aqueous solution of ethyl alcohol and sodium chloride. `NaCl(aq)rarr Na^(+)(aq)+Cl^(-)(aq)` `H_(2)O rarr H^(+)+OH^(-)` At cathode : `Na^(+)(aq)+e^(-)rarr Na(s), " " E_("red")^(@)=-2.71 V` `2H_(2)O+2e^(-)rarr H_(2)(g)+2OH^(-)(aq), " " E_("red")^(@)=-0.83 V` At cathode `H_(2)` gas is liuberated due to greater reduction potential of `H^(+)` than `Na^(+)`. At anode : `Cl^(-)rarr Cl+1e^(-)` `Cl+Cl rarr Cl , E_(oxd.)^(@)=-1.36 V` `H_(2)O(l)rarr 2H^(+)(aq)+1//2O_(2)(g), E_(oxd.)^(@)=-1.23 V` At anode `Cl_(2)` is liberated due to over voltage `C_(2)H_(5)OH+5Cl_(2)+H_(2)Orarr CHCl_(3)+CO_(2)+7HCl` |
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