NEET UG CHEMISTRY MCQ: CHEMICAL KINETICS

The reaction of hydrogen and iodine monochloride is given as:

${H}_2({~g})+2 {ICl}({g}) \longrightarrow 2 {HCl}({g})+{I}_2({~g})$

The reaction is of first order with respect to ${H}_2({~g})$ and ${ICI}({g})$, following mechanisms were proposed.

Mechanism A:

${H}_2({~g})+2 {ICl}({g}) \longrightarrow 2 {HCl}({g})+{I}_2({~g})$

Mechanism B:

$\begin{aligned} & {H}_2({~g})+{ICl}({g}) \longrightarrow {HI}({g}) ; \text { slow } \\ & {HI}({g})+{ICl}({g}) \longrightarrow {HCl}({g})+{I}_2({~g}) ; \text { fast } \end{aligned}$

Which of the above mechanism(s) can be consistent with the given information about the reaction?