Question

The reaction of hydrogen and iodine monochloride is given as:

H₂(g) + 2ICl(g) → 2HCl(g) + I₂(s)

This reaction is of first order with respect to H₂(g) and ICl(g) following mechanisms were proposed.

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

Answer 1

Correct option (d) B only

Explanation :

The slow step is the rate determining step and it involves 1 molecule of H₂(g) and 1 molecule of ICl(g). Hence the rate will be,

i.e. the reaction is 1^st order with respect to H₂(g) and ICl(g).