How does `H_(2)O_(2)` behave as a bleaching agent?

Dry bleaching agent is

Why moist Cl_(2) is act on bleaching agent ?

How does H_(2)SO_(4) react with KCl and KBr?

In which of the following reactions, H_(2)O_(2) acts as oxidising agent ?

In auto oxidation preparation of H_(2)O_(2) the oxidizing agent is

If x' litres of O_(2) is released at STP from one litre of H_(2)O_(2) solution due to decomposition of H_(2)O_(2) then we lable such solution as 'x volume H_(2)O_(2) 2H_(2)O_(2) to 2H_(2)O+O_(2) 30% (w/v) H_(2)O_(2) is called perhydrol. How much volume of O_(2) is released from 100 ml of Phydrol" due to decomposition of H_(2)O_(2) at STP?

Why does O_(3) act as a powerful oxidising agent ?