Home/
Competitive Exams/
JEE Main & Advanced/
Chemistry/
Chemical Kinetics/
Question 720002
JEE Chemistry · Easy

Chemical Kinetics: Rate law MCQ

Solve this quality-checked JEE multiple-choice question, then review the correct answer and explanation.

Timer-based practiceDetailed answer reviewMobile-friendly flow
Rate lawEasyQuestion 720002

Question

For a first-order reaction, the rate is:
  1. A
    r = k[A]
    Correct
  2. B
    r = k[A]²
  3. C
    r = k
  4. D
    r = k[A][B]

Correct answer

r = k[A]

Explanation

First-order means the rate is proportional to the first power of the reactant concentration: r = k[A].

Review Chemical Kinetics notesStart timed chapter practice