NEET Chemistry: Chemical Kinetics — MCQ Test 9

Q6. A zero-order reaction has a rate constant of \( 1.0 \times 10^{-3} \, \text{mol L}^{-1} \text{min}^{-1} \). How long will it take for 80% of a \( 0.2 \, \text{mol L}^{-1} \) reactant to decompose?

Q7. A first-order reaction has a rate constant of \( 0.01155 \, \text{min}^{-1} \). What is the half-life?

Q8. A reaction’s rate constant is \( 2.5 \times 10^{-3} \, \text{s}^{-1} \) at 25°C and \( 7.5 \times 10^{-3} \, \text{s}^{-1} \) at 35°C. What is the activation energy (\( R = 8.314 \, \text{J mol}^{-1} \text{K}^{-1} \))?

Q9. For the reaction \( 2\text{A} + \text{B} \to 3\text{C} \), the rate of disappearance of B is \( 0.01 \, \text{mol L}^{-1} \text{s}^{-1} \). What is the rate of formation of C?

Q10. A reaction’s rate increases by 1.414 times when the concentration of the reactant is doubled. What is the order of the reaction?

NEET Chemistry — Chemical Kinetics

Free MCQ Test 9 of 20

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A first-order reaction has an initial concentration of \( 1.0 \, \text{mol L}^{-1} \). After 40 minutes, the concentration reduces to \( 0.25 \, \text{mol L}^{-1} \). What is the rate constant?

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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, Constant, Decomposition, Increases, and Temperature.

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Preview of Questions in this Test

Q1. A first-order reaction has an initial concentration of \( 1.0 \, \text{mol L}^{-1} \). After 40 minutes, the concentration reduces to \( 0.25 \, \text{mol L}^{-1} \). What is the rate constant?

  • A. 0.0231 min\(^{-1}\)
  • B. 0.0346 min\(^{-1}\)
  • C. 0.0462 min\(^{-1}\)
  • D. 0.0577 min\(^{-1}\)

Q2. A zero-order reaction has a rate constant of \( 3.0 \times 10^{-3} \, \text{mol L}^{-1} \text{s}^{-1} \). If the initial concentration is \( 0.18 \, \text{mol L}^{-1} \), how long will it take for 50% decomposition?

  • A. 30 s
  • B. 60 s
  • C. 45 s
  • D. 90 s

Q3. A zero-order reaction reduces the concentration from \( 0.1 \, \text{mol L}^{-1} \) to \( 0.04 \, \text{mol L}^{-1} \) in 60 s. What is the rate constant?

  • A. 5.0 \(\times\) 10\(^{-4}\) mol L\(^{-1}\) s\(^{-1}\)
  • B. 7.5 \(\times\) 10\(^{-4}\) mol L\(^{-1}\) s\(^{-1}\)
  • C. 1.0 \(\times\) 10\(^{-3}\) mol L\(^{-1}\) s\(^{-1}\)
  • D. 1.5 \(\times\) 10\(^{-3}\) mol L\(^{-1}\) s\(^{-1}\)

Q4. A reaction has the rate law \( \text{Rate} = k[\text{A}]^{2.5} \). What is the overall order?

  • A. 2
  • B. 3
  • C. 1.5
  • D. 2.5

Q5. A reaction’s rate increases 8 times when the temperature rises from 300 K to 330 K. What is the approximate activation energy (\( R = 8.314 \, \text{J mol}^{-1} \text{K}^{-1} \))?

  • A. 28.3 kJ mol\(^{-1}\)
  • B. 42.5 kJ mol\(^{-1}\)
  • C. 70.8 kJ mol\(^{-1}\)
  • D. 56.6 kJ mol\(^{-1}\)

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