Bleaching Agents

Peroxodisulphate salts, (e.g., Na_(2)S_(2)O_(8)) are strong oxidizing agents used be bleaching agents for fats, oils, ets. Given : O_(2)(g)+4H^(o+)(aq)+4e^(-)rarr 2H_(2)O(l)" "E^(c-)=1.23V S_(2)O_(8)^(2-)(aq)+2e^(-)rarr 2SO_(4)^(2-)(aq)" "E^(C-)=2.01V Which of the following statement is ( are ) correct ?

Which of the following is not a bleaching agent ?

The real bleaching agent present in bleaching powder is

SO_2 acts as temporary bleaching agent but Cl_2 acts as permanent bleaching agent. Why ?

Most commonly used bleaching agent is