How is chlorine prepared by electrolytic method ? Explain its reaction with
`NH_(3)` under different conditions.

Explanation

Preparation of chlorine by electrolytic method : Chlorine is obtained by the electrolysis of brine solutions (Conc. NaCl). `Cl_(2)` gas is liberated at anode.
`2NaCl to2" Na"^(+)+2Cl^(-)`
`2" H"_(2)O+2e^(-)to2OH^(-)+H_(2)` (cathode)
`2" Cl"^(-)to Cl_(2)+2e^(-)` (anode)
i) `Cl_(2)` reacts with excess of `NH_(3)`, Nitrogen and ammonium chlorate are formed.
`8" NH"_(3)+3" Cl"_(2)to6" NH"_(4)Cl+N_(2)uarr`
ii) `NH_(3)` reacts with excess of `Cl_(2)` to form `NCl_(3)` and HCl.
`NH_(3)+3" Cl"_(2)tounderset("trichloride")underset("Nitrogen")(NCl_(3)+)3" HCl"`