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Most Important Selected Qs for JEE AdvancedChemistryRedox Reactions

2 moles of a mixture of O ₂ and O ₃ is reacted with excess of acidified solution of KI . The iodine liberated require 1 L of 2 M hypo solution for complete reaction. The weight % of O ₃ in the initial sample is x . Find x .

Correct answer

60

Step-by-step solution

KI + O ₃ I ₂+ H ₂ O + O ₂v . f=2 v . f=2 aligned & moles & = x . aligned I ₂+ Na ₂ ~S ₂ O ₃ I ⁻+ Na ₂ ~S ₄ O ₆ array ll v . f =2 & M=2 & V=1 ~L v . f=1 array aligned & eq of O ₃= eq of I ₂= eq of hypo & 2 x=2 & x=1 mole aligned weight % of O₃= 1 48 1 48+1 32 100= 3 5 100=60 % Ans. 60

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