NEET Chemistry: Chemical Kinetics — MCQ Test 7

Q6. A first-order reaction has a rate constant of \( 0.0289 \, \text{min}^{-1} \). What is the time for 50% completion?

Q7. A first-order reaction has a half-life of 16 minutes. What percentage of the reactant decomposes in 48 minutes?

Q8. A zero-order reaction has a rate constant of \( 5.0 \times 10^{-4} \, \text{mol L}^{-1} \text{s}^{-1} \). If the initial concentration is \( 0.2 \, \text{mol L}^{-1} \), how long will it take for 20% decomposition?

Q9. A reaction’s rate constant increases from \( 4.0 \times 10^{-4} \, \text{s}^{-1} \) at 280 K to \( 1.2 \times 10^{-3} \, \text{s}^{-1} \) at 290 K. What is the activation energy (\( R = 8.314 \, \text{J mol}^{-1} \text{K}^{-1} \))?

Q10. A first-order reaction has a rate constant of \( 0.0173 \, \text{min}^{-1} \). What percentage of the reactant decomposes in 80 minutes?

NEET Chemistry — Chemical Kinetics

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A second-order reaction has a rate constant of \( 0.08 \, \text{L mol}^{-1} \text{s}^{-1} \) and an initial concentration of \( 0.5 \, \text{mol L}^{-1} \). What is the time for 75% completion?

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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, Constant, Concentration, Completion, Molecularity, and Elementary.

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 second-order reaction has a rate constant of \( 0.08 \, \text{L mol}^{-1} \text{s}^{-1} \) and an initial concentration of \( 0.5 \, \text{mol L}^{-1} \). What is the time for 75% completion?

  • A. 50 s
  • B. 100 s
  • C. 62.5 s
  • D. 75 s

Q2. A zero-order reaction has an initial concentration of \( 0.12 \, \text{mol L}^{-1} \) and a rate constant of \( 2.0 \times 10^{-3} \, \text{mol L}^{-1} \text{s}^{-1} \). What is the half-life?

  • A. 20 s
  • B. 30 s
  • C. 40 s
  • D. 15 s

Q3. The molecularity of the elementary step \( \text{NO} + \text{O}_3 \to \text{NO}_2 + \text{O}_2 \) is:

  • A. 1
  • B. 2
  • C. 3
  • D. 4

Q4. A first-order gaseous reaction has an initial pressure of 1.5 atm. After 25 s, the total pressure is 2.0 atm. What is the rate constant?

  • A. 0.0115 s\(^{-1}\)
  • B. 0.0203 s\(^{-1}\)
  • C. 0.0162 s\(^{-1}\)
  • D. 0.0092 s\(^{-1}\)

Q5. A first-order reaction is 10% complete in 5 minutes. What is the rate constant?

  • A. 0.0211 min\(^{-1}\)
  • B. 0.0346 min\(^{-1}\)
  • C. 0.0154 min\(^{-1}\)
  • D. 0.0462 min\(^{-1}\)

+ 5 more questions in the actual test

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