ABC26PH0902 · Chemical Kinetics

Subject: Physical Chemistry · Chapter: Chemical Kinetics · Topic: Rate Laws Order · Exam: NET JUNE 2013 · Marks: 2 · Difficulty: Hard

The rate equation for the reaction $2 \mathrm{AB}+\mathrm{B}_{2} \rightarrow 2 \mathrm{AB}_{2}$ is given byrate $=\mathrm{k}[\mathrm{AB}]\left[\mathrm{B}_{2}\right]$ A possible mechanism consistent with this rate law is
(a)$2 \mathrm{AB}+\mathrm{B}_{2} \xrightarrow{\text { slow }} 2 \mathrm{AB}_{2}$
(b)$\mathrm{AB}+\mathrm{AB} \leftrightharpoons \mathrm{A}_{2} \mathrm{B}_{2}$ (fast) $; \mathrm{A}_{2} \mathrm{B}_{2}+\mathrm{B}_{2} \xrightarrow{\text { slow }} 2 \mathrm{AB}_{2}$
(c)$\mathrm{AB}+\mathrm{B}_{2} \xrightarrow{\text { slow }} \mathrm{AB}_{3} ; \mathrm{AB}_{3}+\mathrm{AB} \xrightarrow{\text { fast }} 2 \mathrm{AB}_{2}$
(d)$\mathrm{AB}+\mathrm{B}_{2} \leftrightharpoons \mathrm{AB}_{3}$ (fast) $; \mathrm{AB}_{3}+\mathrm{AB} \xrightarrow{\text { slow }} 2 \mathrm{AB}_{2}$
Answer
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Explanation
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