The products obtained when chlorine gas reacts with cold and dilute aqueous NaOH are:
Case -1: Hot Concentrated NaOH
The reaction between chlorine and hot concentrated sodium hydroxide solution is:
NaOH+Cl2→5NaCl+NaClO3+3H2O
Case -2:Cold NaOH
The reaction between chlorine and cold dilute sodium hydroxide solution is:
2NaOH+Cl2→NaCl+NaClO+H2O