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Question

The reaction of hydrogen and iodine monochloride is given as:
H2(g)+2ICl(g)2HCl(g)+I2(g)


This 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)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?


A

A only

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B

B only

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C

A and B both

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D

Neither A nor B

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Solution

The correct option is B

B only


In multi-step reactions, the slowest step is regarded as the rds or the rate determining step. Hence, the rate expression only takes the slowest step into account.

H2(g)+ICl(g)HCl(g)+HI(g) is first order with respect to H2 and ICl. Therefore, for the given reaction, mechanism (B) is consistent with the given data.


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