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Chemistry Reaction Kinetics Online Mcqs Test

Mustansar KhanLast Updated: October 14, 2025

Important Chemistry Reaction Kinetics Question and Answer

Total Questions:	50
Time Allowed:	30 Minutes
Total Marks:	50
How to Attempt Test:	Please choose the right Option in MCQ-type question.
Test Helpful For:	Chemistry Test ECAT Test MDCAT Test FPSC/PPSC/SPSC/KPPSC/BPSC/AJKPSC/NTS Chemistry Interview Question Answer

MDCAT Chemistry Reaction Kinetics Practice Test Online With Explanation

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1. What does the rate constant (k) represent in a rate law?

The equilibrium constant

The proportionality factor in rate equation

The change in volume

The energy required

2. Which order reaction is independent of concentration?

Second

First

Zero

Third

3. What is the unit of rate constant for a first-order reaction?

s⁻¹

mol/s

mol/L

L/mol/s

4. In zero-order reactions, rate is:

Dependent on concentration

Constant

Very high

Proportional to square of concentration

5. Which unit is commonly used for the rate of reaction?

mol/L/s

mol

L/mol/s

mol/L

6. Which of the following can be used to monitor a change in pressure during a reaction?

Spectrometer

Manometer

pH meter

Thermometer

7. How does temperature affect the rate of reaction?

Has no effect

Slows it down

Only affects physical changes

Increases particle collisions and reaction rate

8. Which factor increases the rate of reaction by lowering activation energy?

Concentration

Catalyst

Light

Pressure

9. Which condition will generally increase the frequency of collisions in a reaction?

Decreased surface area

Increased concentration

Less temperature

Lower pressure

10. If rate = k[A]²[B], what is the overall reaction order?

11. What is the order of reaction if doubling [A] quadruples the rate?

First

Third

Zero

Second

12. Which order reaction shows a straight line when concentration is plotted vs time?

Second-order

Zero-order

Third-order

First-order

13. Which statement is true for a catalyst?

Changes equilibrium position

Becomes part of product

Increases yield

Increases reaction rate

14. How does a catalyst affect the activation energy?

Reduces it

Has no effect

Eliminates it

Increases it

15. What happens to rate of reaction if temperature is decreased?

Remains constant

Increases

Becomes zero

Decreases

16. Which experimental data is used in the method of initial rates?

Rate at the beginning of reaction

Concentration at specific times

Change in temperature

Volume of gases

17. For a zero-order reaction, doubling [A] will:

Triple the rate

Halve the rate

Have no effect

Double the rate

18. Which factor increases reaction rate in gaseous reactions?

Removing heat

Reducing pressure

Decreasing temperature

Increasing pressure

19. In a second-order reaction, which plot gives a straight line?

ln[A]² vs time

1/[A] vs time

ln[A] vs time

[A] vs time

20. What does a high rate of reaction indicate?

The reactants are stable

Reactants are converting to products quickly

Few molecules are reacting

The reaction is slow

21. Which of the following is NOT a factor affecting the rate of reaction?

Surface area

Temperature

Pressure

Molecular weight

22. What happens to reaction rate when the concentration of a reactant is increased?

It remains unchanged

It depends on the product

It usually increases

It decreases

23. Which one of the following is correct for the rate law of an elementary reaction?

Must be determined experimentally

Depends only on products

Derived from balanced equation

Includes only rate constant

24. Which plot gives a straight line for a zero-order reaction?

ln(rate) vs time

1/[A] vs time

ln[A] vs time

[A] vs time

25. What is the unit of rate constant for a second-order reaction?

s⁻¹

mol/L

L/mol/s

mol/s

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26. For a first-order reaction, a plot of ln[reactant] vs time gives:

A straight line

A curve

A horizontal line

No relation

27. Which method is used to determine the order of reaction experimentally?

Solubility test

Initial rate method

Colorimetry only

Titration only

28. Which instrument is commonly used to measure gas volume in rate experiments?

Barometer

Gas syringe

Thermometer

Spectroscope

29. When a catalyst is used, what changes?

Enthalpy of reaction

Reactant concentrations

Activation energy

Products formed

30. Which reaction occurs faster?

Hot + powder

Room temp + block

Cold + liquid

Cold + solid

31. The rate law for a reaction is rate = k[A][B]. What is the order of the reaction?

32. What does the specific rate constant (k) depend on?

Pressure

Temperature

Time

Concentration

33. What kind of reaction rate is not influenced by concentration?

Zero-order

First-order

Second-order

Pseudo-first-order

34. Which of the following graphs indicates a first-order reaction?

[A] vs time is a straight line

ln[A] vs time is a straight line

1/[A] vs time is a straight line

ln[A] vs [A] is a straight line

35. If a reaction’s rate doubles when [A] is doubled, what is its order with respect to A?

Second

Third

First

Zero

36. What is the rate of a chemical reaction?

The mass of reactants

The speed at which products form or reactants are consumed

The color change during reaction

The energy change in the reaction

37. Which of the following best defines activation energy?

Energy released in a reaction

Heat of the product

Energy lost as heat

Energy required to start a reaction

38. What is the unit of rate constant for a zero-order reaction?

mol/s

L²/mol²/s

mol/L/s

s⁻¹

39. Why do powdered solids react faster than large chunks?

They have greater surface area

They have more color

They dissolve better

They have higher mass

40. Which of the following is true for pseudo-first-order reactions?

No catalyst involved

All reactants are present in equal amounts

Reaction is zero-order

One reactant is in large excess

41. Which reaction has the slowest rate?

Combustion of methane

Strong acid + base

Explosion

Rusting of iron

42. How does surface area affect the rate of reaction?

Decreases it

Affects only gases

No effect

Increases it

43. What is meant by half-life of a reaction?

Time taken for 50% of reactant to react

Time for maximum rate

Time until equilibrium

Time taken to double the reactant

44. What is the order of reaction?

Sum of powers of reactants in rate law

Number of products formed

Time taken for reaction

Number of atoms in a molecule

45. Which order of reaction has a constant half-life?

Second-order

Third-order

Zero-order

First-order

46. Which technique is commonly used to determine the rate of color-changing reactions?

Spectrophotometry

Chromatography

Thermometry

Manometer

47. The reaction rate is usually measured in:

L/s

mol

mol/s

mol/L

48. What is the best method to study rate of a reaction with color change?

Gravimetric analysis

Titration

Spectrophotometry

Manometry

49. What is meant by molecularity of a reaction?

Moles of reactants

Number of atoms in the product

Number of molecules involved in an elementary step

Total number of molecules in the system

50. What is the dimension of rate constant for third-order reactions?

mol/L/s

L/mol/s

L²/mol²/s

s⁻¹

Complete Guide for Chemistry Reaction Kinetics Online Mcqs Test

Chemistry Reaction Kinetics Online Mcqs Test is a crucial part of the selection process for government jobs and entrance exams. This online test allows you to practice without any cost.

Why Take This Test?

We have compiled these questions from past papers of PPSC, FPSC, NTS, and OTS. By attempting this quiz, you will:

Understand the difficulty level of the actual exam.
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Note: At the end of the quiz, you will see a detailed result card with the correct answers.

Important Chemistry Reaction Kinetics Question and Answer

MDCAT Chemistry Reaction Kinetics Practice Test Online With Explanation

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Complete Guide for Chemistry Reaction Kinetics Online Mcqs Test

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