Question
Sat December 15, 2012 By: Saloni
bleaching action of SO2 is due to which of the following?and explain the answer with equation.
 
1) reduction
2)oxidation
 

redox rxn

Expert Reply
Sun December 16, 2012
SO2 is a reducing agent. When it reacts with water, it produces sulfonic acid, H2SO3. The anion of this acid is sulfite and bisulfite. These are added to foods to block the action of oxidation from atmospheric oxygen.
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