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 is/are incorrect regarding above mechanism ?

Answer:

A, B, C

Solution:

Rate $= K_{3} [H_{2}] [$ I $]$

$\frac{K _{1}}{K _{- 1}} = \frac{[ I ] ^{2}}{[ I _{2} ]}$

$\frac{K _{2}}{K _{- 2}} = \frac{[ H _{2} I ]}{[ H _{2} ] [ I ]}$

From eq. 1, 2 and 3

Rate $= K_{3} \cdot \frac{K _{1}}{K _{- 1}} \cdot \frac{K _{2}}{K _{- 2}} [H_{2}] [I_{2}]$

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

⏱ 2mℹ️ Source: QB

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