Question
Bleaching of flowers by Cl2 is permanent, while by SO2 it is temporary. Give reason.
Solution
Cl2 bleaches by oxidation, while SO2 bleaches by reduction.
When Chlorine react with water it form nascent oxygen which act as oxidising agent.
Cl2 +H2O -----> 2HCl +[O]
no such oxidising agent is shown in case of SO2
SO2 + H2O ---->H2SO3
Hence product bleached by SO2 is reoxidised by air to its original form.
When Chlorine react with water it form nascent oxygen which act as oxidising agent.
Cl2 +H2O -----> 2HCl +[O]
no such oxidising agent is shown in case of SO2
SO2 + H2O ---->H2SO3
Hence product bleached by SO2 is reoxidised by air to its original form.
