AIPMT PRELIMS2007Chemistry-Chemical Kinetics
AIPMT PRELIMS 2007 Chemistry Reaction Mechanisms MCQ Question
Type: MCQ-conceptual-Hard-Class 12
The reaction of hydrogen and iodine monochloride is given as: H₂(g) + 2ICl(g) → 2HCl(g) + I₂(g) The reaction is of first order with respect to H₂(g) and ICl(g), following mechanisms were proposed. Mechanism A: H₂(g) + 2ICl(g) → 2HCl(g) + I₂(g) Mechanism B: H₂(g) + ICl(g) → HI(g); slow HI(g) + ICl(g) → HCl(g) + I₂(g); fast Which of the above mechanism(s) can be consistent with the given information about the reaction?
A
A and B both
B
neither A nor B
C
A only
D
B only
Correct Answer
Option D
Detailed Explanation
Mechanism B is consistent as it shows the reaction is first order with respect to both H₂ and ICl, matching the given rate law.
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