NEET Chemistry: Chemical Kinetics — MCQ Test 18

Q6. A reaction has the rate law \( \text{Rate} = k[\text{A}]^2[\text{B}] \). If the concentration of A is doubled and B is tripled, what happens to the rate?

Q7. The molecularity of the elementary step \( 2\text{NO} + \text{O}_2 \to 2\text{NO}_2 \) is:

Q8. A reaction has the rate law \( \text{Rate} = k[\text{A}]^2 \). If the concentration of A is tripled, by how many times will the rate increase?

Q9. A first-order gaseous reaction has an initial pressure of 1.2 atm. After 50 s, the total pressure is 1.6 atm. What is the rate constant?

Q10. The decomposition of a reactant follows zero-order kinetics with a rate constant of \( 2.0 \times 10^{-3} \, \text{mol L}^{-1} \text{s}^{-1} \). If the initial concentration is \( 0.1 \, \text{mol L}^{-1} \), how long will it take for the concentration to decrease to \( 0.05 \, \text{mol L}^{-1} \)?

NEET Chemistry — Chemical Kinetics

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A reaction has the rate law \( \text{Rate} = k[\text{A}][\text{B}]^2 \). If the concentration of A is halved and B is tripled, what happens to the rate?

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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, Concentration, Fraction, Reactant, Increases, and Increased.

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 reaction has the rate law \( \text{Rate} = k[\text{A}][\text{B}]^2 \). If the concentration of A is halved and B is tripled, what happens to the rate?

  • A. Increases by 9 times
  • B. Decreases to half
  • C. Increases by 4.5 times
  • D. Remains same

Q2. A first-order reaction has a half-life of 18 minutes. What fraction of the reactant remains after 54 minutes?

  • A. 1/4
  • B. 1/8
  • C. 1/2
  • D. 1/16

Q3. A reaction’s rate increases by 27 times when the concentration of the reactant is increased by 3 times. What is the order of the reaction?

  • A. 3
  • B. 2
  • C. 4
  • D. 1

Q4. The decomposition of a gas follows first-order kinetics with an initial pressure of 0.8 atm. After 100 s, the total pressure is 1.2 atm. What is the rate constant?

  • A. 4.62 \(\times\) 10\(^{-3}\) s\(^{-1}\)
  • B. 5.78 \(\times\) 10\(^{-3}\) s\(^{-1}\)
  • C. 8.66 \(\times\) 10\(^{-3}\) s\(^{-1}\)
  • D. 6.93 \(\times\) 10\(^{-3}\) s\(^{-1}\)

Q5. The decomposition of a gas follows first-order kinetics with an initial pressure of 2.0 atm. After 60 s, the total pressure is 2.8 atm. What is the rate constant?

  • A. 0.00462 s\(^{-1}\)
  • B. 0.00675 s\(^{-1}\)
  • C. 0.00892 s\(^{-1}\)
  • D. 0.0115 s\(^{-1}\)

+ 5 more questions in the actual test

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