Chemistry - Chemical Kinetics Question with Solution | TestHub

ChemistryChemical KineticsRate of Reactions/Rate LawMedium2 minQB

ChemistryMediummultiple choice

Passage / Comprehension

Consider a three-step mechanism: H₂ + I₂ → 2HI

(i) I₂ $⇌_{K_{- 1}}^{K_{1}}$ 2I (fast)

(ii) H₂ + I $⇌_{K_{- 2}}^{K_{2}}$ H₂I (fast)

(iii) H₂I + I $K_{3}$ 2HI (slowest)

Which of the following qualitative plot of potential energy (PE) $v / s$ reaction coordinates is/are incorrect if $k_{1} >> k_{2} ≫ k_{3}$ and reaction is exothermic :

Options:(select one or more)

Answer:

A, B, D

Solution:

$K_{1} ≫ K_{2} ≫ K_{3}$

$Ea_{1} < Ea_{2} < Ea_{3}$

Stream:JEESubject:ChemistryTopic:Chemical KineticsSubtopic:Rate of Reactions/Rate Law

⏱ 2mℹ️ Source: QB

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