NEET Chemistry: Chemical Kinetics — MCQ Test 11

Q6. A reaction has a rate constant of \( 1.5 \times 10^{-2} \, \text{s}^{-1} \). What is its order if the unit of the rate constant is \( \text{s}^{-1} \)?

Q7. A second-order reaction has a rate constant of \( 0.02 \, \text{L mol}^{-1} \text{s}^{-1} \) and an initial concentration of \( 0.25 \, \text{mol L}^{-1} \). What is the time for 80% completion?

Q8. A second-order reaction has a rate constant of \( 0.02 \, \text{L mol}^{-1} \text{min}^{-1} \) and an initial concentration of \( 0.5 \, \text{mol L}^{-1} \). What is the half-life?

Q9. The rate law of a reaction is \( \text{Rate} = k[\text{A}]^{3/2} \). What is the overall order?

Q10. A first-order reaction has a rate constant of \( 0.0289 \, \text{min}^{-1} \). What percentage of the reactant decomposes in 48 minutes?

NEET Chemistry — Chemical Kinetics

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A first-order reaction has a half-life of 20 minutes. How long will it take for 87.5% of the reactant to decompose?

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About this NEET MCQ Test

This page provides a free online MCQ test for NEET Chemistry preparation, focusing specifically on the chapter Chemical Kinetics. It contains 10 carefully selected multiple-choice questions (MCQs) designed to test your conceptual understanding and exam readiness.

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Key concepts covered in this specific test include Reaction, Reactant, Decompose, Kinetics, Constant, and Concentration.

Taking these timed MCQ tests helps you simulate the real NEET exam environment. Detailed step-by-step explanations are provided for every question to help you learn from your mistakes and strengthen your fundamentals.

Preview of Questions in this Test

Q1. A first-order reaction has a half-life of 20 minutes. How long will it take for 87.5% of the reactant to decompose?

  • A. 40 min
  • B. 50 min
  • C. 70 min
  • D. 60 min

Q2. A reaction follows second-order kinetics with a rate constant of \( 0.02 \, \text{L mol}^{-1} \text{s}^{-1} \). If the initial concentration is \( 0.5 \, \text{mol L}^{-1} \), what is the half-life?

  • A. 50 s
  • B. 75 s
  • C. 100 s
  • D. 125 s

Q3. For a reaction, the initial rate doubles when the concentration of the reactant is quadrupled. What is the order of the reaction?

  • A. 1
  • B. 2
  • C. 0
  • D. 0.5

Q4. A reaction has the rate law \( \text{Rate} = k[\text{A}][\text{B}] \). If the concentration of A is tripled and B is halved, what happens to the rate?

  • A. Triples
  • B. Halves
  • C. Increases by 1.5 times
  • D. Remains same

Q5. A first-order reaction has a half-life of 15 minutes. What percentage of the reactant decomposes in 45 minutes?

  • A. 50%
  • B. 75%
  • C. 90%
  • D. 87.5%

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