Chemistry Reaction Kinetics Online Mcqs Test

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Question 1

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

Answer

Time taken for 50% of reactant to react

Answer

Time until equilibrium

Answer

Time for maximum rate

Answer

Time taken to double the reactant

Question 2

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

Question 3

3. The reaction rate is usually measured in:

Question 4

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

Answer

Temperature

Answer

Surface area

Answer

Molecular weight

Question 5

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

Question 6

6. What is the rate of a chemical reaction?

Answer

The mass of reactants

Answer

The energy change in the reaction

Answer

The color change during reaction

Answer

The speed at which products form or reactants are consumed

Question 7

7. What is the order of reaction?

Answer

Time taken for reaction

Answer

Sum of powers of reactants in rate law

Answer

Number of products formed

Answer

Number of atoms in a molecule

Question 8

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

Question 9

9. Which factor increases reaction rate in gaseous reactions?

Answer

Increasing pressure

Answer

Reducing pressure

Answer

Decreasing temperature

Answer

Removing heat

Question 10

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

Answer

Volume of gases

Answer

Rate at the beginning of reaction

Answer

Concentration at specific times

Answer

Change in temperature

Question 11

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

Answer

Second-order

Answer

First-order

Answer

Third-order

Answer

Zero-order

Question 12

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

Answer

Gravimetric analysis

Answer

Spectrophotometry

Question 13

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

Question 14

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

Answer

ln[A] vs time

Answer

ln(rate) vs time

Answer

[A] vs time

Answer

1/[A] vs time

Question 15

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

Question 16

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

Answer

L²/mol²/s

Question 17

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

Answer

Remains constant

Answer

Becomes zero

Question 18

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

Answer

Concentration

Question 19

19. When a catalyst is used, what changes?

Answer

Reactant concentrations

Answer

Products formed

Answer

Enthalpy of reaction

Answer

Activation energy

Question 20

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

Answer

Concentration

Answer

Temperature

Question 21

21. 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 22

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

Answer

[A] vs time is a straight line

Answer

1/[A] vs time is a straight line

Answer

ln[A] vs time is a straight line

Answer

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

Question 23

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

Answer

First-order

Answer

Second-order

Answer

Zero-order

Answer

Third-order

Question 24

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

Answer

Spectrophotometry

Answer

Chromatography

Answer

Thermometry

Question 25

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

Answer

Colorimetry only

Answer

Initial rate method

Answer

Solubility test

Answer

Titration only

Question 26

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

Answer

The proportionality factor in rate equation

Answer

The energy required

Answer

The change in volume

Answer

The equilibrium constant

Question 27

27. Which statement is true for a catalyst?

Answer

Changes equilibrium position

Answer

Becomes part of product

Answer

Increases reaction rate

Answer

Increases yield

Question 28

28. How does a catalyst affect the activation energy?

Answer

Increases it

Answer

Eliminates it

Answer

Has no effect

Answer

Reduces it

Question 29

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

Question 30

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

Answer

Derived from balanced equation

Answer

Depends only on products

Answer

Includes only rate constant

Answer

Must be determined experimentally

Question 31

31. Which of the following best defines activation energy?

Answer

Heat of the product

Answer

Energy required to start a reaction

Answer

Energy released in a reaction

Answer

Energy lost as heat

Question 32

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

Answer

L²/mol²/s

Question 33

33. Which reaction has the slowest rate?

Answer

Strong acid + base

Answer

Rusting of iron

Answer

Combustion of methane

Question 34

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

Answer

Thermometer

Answer

Spectroscope

Answer

Gas syringe

Question 35

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

Answer

Thermometer

Answer

Spectrometer

Question 36

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

Answer

One reactant is in large excess

Answer

Reaction is zero-order

Answer

No catalyst involved

Answer

All reactants are present in equal amounts

Question 37

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

Answer

It usually increases

Answer

It remains unchanged

Answer

It decreases

Answer

It depends on the product

Question 38

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

Answer

They dissolve better

Answer

They have more color

Answer

They have greater surface area

Answer

They have higher mass

Question 39

39. Which reaction occurs faster?

Answer

Cold + solid

Answer

Room temp + block

Answer

Cold + liquid

Answer

Hot + powder

Question 40

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

Answer

Triple the rate

Answer

Halve the rate

Answer

Have no effect

Answer

Double the rate

Question 41

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

Answer

Pseudo-first-order

Answer

Second-order

Answer

First-order

Answer

Zero-order

Question 42

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

Answer

ln[A]² vs time

Answer

1/[A] vs time

Answer

ln[A] vs time

Answer

[A] vs time

Question 43

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

Answer

A horizontal line

Answer

A straight line

Answer

No relation

Question 44

44. How does temperature affect the rate of reaction?

Answer

Has no effect

Answer

Increases particle collisions and reaction rate

Answer

Only affects physical changes

Answer

Slows it down

Question 45

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

Answer

Decreases it

Answer

Increases it

Answer

Affects only gases

Question 46

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

Answer

Lower pressure

Answer

Less temperature

Answer

Decreased surface area

Answer

Increased concentration

Question 47

47. What is meant by molecularity of a reaction?

Answer

Total number of molecules in the system

Answer

Number of atoms in the product

Answer

Moles of reactants

Answer

Number of molecules involved in an elementary step

Question 48

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

Question 49

49. Which order reaction is independent of concentration?

Question 50

50. In zero-order reactions, rate is:

Answer

Proportional to square of concentration

Answer

Dependent on concentration

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

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Important Chemistry Reaction Kinetics Question and Answer

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