For a reaction :
2H₂O₂ => 2H₂O + O₂
the proposed mechanismis as given below:
(1) H₂O₂ + I− → H₂O + IO− (slow)
(2) H₂O₂ + IO− → H₂O + I− + O₂ (fast)

(i) Write rate law for the reaction.