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Most Important Selected Qs for JEE AdvancedChemistryChemical Kinetics

Nitrogen dioxide reacts with ozone to form Dinitrogen Pentoxide and Oxygen. The reaction can be represented as. 2 NO ₂( ~g )+ O ₃( ~g ) N ₂ O ₅( ~g )+ O ₂( ~g ) Experimentally the overall rate of the reaction was found to be first order in both NO ₂ as well as O ₃ i.e. rate = K [ NO ₂ ] [ O ₃ ] Mechanism I: gathered NO ₂+ O ₃ NO ₃+ O ₂ Slow NO ₃+ NO ₂ ~N ₂ O ₅ Fast gathered Mechanism II : gathered O ₃ O ₂+ O Fast NO

Options

  1. AMechanism I is consistent with experimental observation
  2. BMechanism II is consistent with experimental observation
  3. CMechanism I is not consistent with experimental observation
  4. DMechanism II is not consistent with experimental observation

Correct answer

D. Mechanism II is not consistent with experimental observation

Step-by-step solution

Mechanism I rate = K [ NO ₂ ]^1 [ O ₃ ]^1 Mechanism II aligned & rate = K [ NO ₂ ][ O ] & = K [ NO ₂ ] K _ eq [ O ₃ ] [ O ₂ ] & K ( ~K _ eq ) [ NO ₂ ] [ O ₃ ] [ O ₂ ] aligned Hence, Mechanism II is not consistent with observation

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