Chemistry Reaction Kinetics Online Mcqs Test

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Question 1

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

Answer

The proportionality factor in rate equation

Answer

The equilibrium constant

Answer

The energy required

Answer

The change in volume

Question 2

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

Answer

They have more color

Answer

They dissolve better

Answer

They have greater surface area

Answer

They have higher mass

Question 3

3. What is meant by molecularity of a reaction?

Answer

Number of molecules involved in an elementary step

Answer

Moles of reactants

Answer

Total number of molecules in the system

Answer

Number of atoms in the product

Question 4

4. Which of the following best defines activation energy?

Answer

Heat of the product

Answer

Energy released in a reaction

Answer

Energy required to start a reaction

Answer

Energy lost as heat

Question 5

5. How does a catalyst affect the activation energy?

Answer

Eliminates it

Answer

Reduces it

Answer

Increases it

Answer

Has no effect

Question 6

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

Answer

ln[A] vs time

Answer

[A] vs time

Answer

1/[A] vs time

Answer

ln[A]² vs time

Question 7

7. Which factor increases reaction rate in gaseous reactions?

Answer

Increasing pressure

Answer

Reducing pressure

Answer

Decreasing temperature

Answer

Removing heat

Question 8

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

Answer

L²/mol²/s

Question 9

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

Answer

1/[A] vs time is a straight line

Answer

ln[A] vs time is a straight line

Answer

[A] vs time is a straight line

Answer

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

Question 10

10. When a catalyst is used, what changes?

Answer

Reactant concentrations

Answer

Activation energy

Answer

Enthalpy of reaction

Answer

Products formed

Question 11

11. The reaction rate is usually measured in:

Question 12

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

Question 13

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

Answer

It remains unchanged

Answer

It depends on the product

Answer

It decreases

Answer

It usually increases

Question 14

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

Answer

Reaction is zero-order

Answer

One reactant is in large excess

Answer

All reactants are present in equal amounts

Answer

No catalyst involved

Question 15

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

Answer

Spectrophotometry

Answer

Thermometry

Answer

Chromatography

Question 16

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

Answer

L²/mol²/s

Question 17

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

Answer

Molecular weight

Answer

Surface area

Answer

Temperature

Question 18

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

Question 19

19. In zero-order reactions, rate is:

Answer

Dependent on concentration

Answer

Proportional to square of concentration

Question 20

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

Answer

Includes only rate constant

Answer

Derived from balanced equation

Answer

Must be determined experimentally

Answer

Depends only on products

Question 21

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

Answer

No relation

Answer

A horizontal line

Answer

A straight line

Question 22

22. How does temperature affect the rate of reaction?

Answer

Slows it down

Answer

Has no effect

Answer

Only affects physical changes

Answer

Increases particle collisions and reaction rate

Question 23

23. What does a high rate of reaction indicate?

Answer

Few molecules are reacting

Answer

The reactants are stable

Answer

Reactants are converting to products quickly

Answer

The reaction is slow

Question 24

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

Question 25

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

Answer

Third-order

Answer

Zero-order

Answer

Second-order

Answer

First-order

Question 26

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

Question 27

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

Answer

Time taken to double the reactant

Answer

Time until equilibrium

Answer

Time taken for 50% of reactant to react

Answer

Time for maximum rate

Question 28

28. Which order reaction is independent of concentration?

Question 29

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

Answer

Becomes zero

Answer

Remains constant

Question 30

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

Question 31

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

Answer

Increased concentration

Answer

Less temperature

Answer

Decreased surface area

Answer

Lower pressure

Question 32

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

Answer

Concentration

Question 33

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

Answer

Second-order

Answer

First-order

Answer

Zero-order

Answer

Pseudo-first-order

Question 34

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

Answer

Decreases it

Answer

Affects only gases

Answer

Increases it

Question 35

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

Answer

Change in temperature

Answer

Rate at the beginning of reaction

Answer

Concentration at specific times

Answer

Volume of gases

Question 36

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

Answer

Concentration

Answer

Temperature

Question 37

37. Which reaction has the slowest rate?

Answer

Rusting of iron

Answer

Combustion of methane

Answer

Strong acid + base

Question 38

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

Answer

Solubility test

Answer

Initial rate method

Answer

Titration only

Answer

Colorimetry only

Question 39

39. What is the order of reaction?

Answer

Number of products formed

Answer

Number of atoms in a molecule

Answer

Time taken for reaction

Answer

Sum of powers of reactants in rate law

Question 40

40. What is the rate of a chemical reaction?

Answer

The mass of reactants

Answer

The speed at which products form or reactants are consumed

Answer

The color change during reaction

Answer

The energy change in the reaction

Question 41

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

Answer

Gas syringe

Answer

Spectroscope

Answer

Thermometer

Question 42

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

Answer

Zero-order

Answer

First-order

Answer

Second-order

Answer

Third-order

Question 43

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

Answer

Spectrophotometry

Answer

Gravimetric analysis

Question 44

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

Answer

Halve the rate

Answer

Triple the rate

Answer

Double the rate

Answer

Have no effect

Question 45

45. Which reaction occurs faster?

Answer

Cold + liquid

Answer

Room temp + block

Answer

Cold + solid

Answer

Hot + powder

Question 46

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

Question 47

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

Question 48

48. Which statement is true for a catalyst?

Answer

Increases yield

Answer

Increases reaction rate

Answer

Changes equilibrium position

Answer

Becomes part of product

Question 49

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

Answer

Spectrometer

Answer

Thermometer

Question 50

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

Answer

1/[A] vs time

Answer

ln(rate) vs time

Answer

ln[A] vs time

Answer

[A] vs time

Question 51

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Total Questions:	50
Time Allowed:	30 Minutes
Total Marks:	50
How to Attempt Test:	Please choose the right Option in MCQ-type question.
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Chemistry Reaction Kinetics Online Mcqs Test

Important Chemistry Reaction Kinetics Question and Answer

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Important Chemistry Reaction Kinetics Question and Answer

MDCAT Chemistry Reaction Kinetics Practice Test Online With Explanation

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Key Preparation Tips:

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