Question
The reaction of hydrogen and iodine monochloride is given as:
H2 (g) + 2ICl (g) → 2 HCl (g) + I2 (g)
This reaction is of first order with respect to H2 (g) and ICI (g), following mechanisms were proposed:
Mechanism A:
H2 (g) + 2 ICl (g) → 2 HCl (g) + I2 (g)
Mechanism B:
H2 (g) + ICl (g) →HCl (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?
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B only
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A and B both
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Neither A nor B
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A only
Solution
B.
A and B both
The rate of reaction always depends on slow reaction.
H2 (g) + ICl (g) →HCl (g) + HI (g) is a first order reaction respect to H2 and I2 can measure with the help of both mechanism A and B.
