Target Exam

CUET

Subject

Chemistry

Chapter

Physical: Chemical Kinetics

Question:

Following mechanism has been proposed for the reaction

2A + B → D + E

A + B → C + D      (slow)

A + C → E     (fast)

What is the expression for rate law?

Options:

r = k[A]2[B]

r = k[A][B]

r = k[A]2

r = k[A][C]

Correct Answer:

r = k[A][B]

Explanation:

Slowest step of mechanism is the rate determining step.

A + B → C + D      (slow)

r = k[A][B]