HARDMCQ SINGLEIChO (Chemistry Olympiad)Physical ChemistryChemical kineticsAchiever Section
The reaction of hydrogen and iodine monochloride is given as: H g 2ICl g 2HCl g I g -> The reaction is of first order with respect to H2 (g) and ICl(g), following mechanisms were proposed. Mechanism A: H g 2ICl g 2HCl g I g -> Mechanism B: H g ICl g HI g ;slow HI g ICl g HCl g I : 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
Explanation
As the slowest step is the rate determining step thus the mechanism B will be more consistent with the given information also because it involve one molecule of H2 and one molecule of ICl it can expressed as r = k [H2 ][ICl] Which shows that the reaction is first order w.r.t. both H2 & ICl
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