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

Zero

First

Third

Second

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

Concentration at specific times

Volume of gases

Rate at the beginning of reaction

Change in temperature

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

Zero-order

Second-order

Third-order

First-order

4. In zero-order reactions, rate is:

Dependent on concentration

Constant

Proportional to square of concentration

Very high

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

Pressure

Temperature

Surface area

Molecular weight

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

mol/L/s

L²/mol²/s

mol/s

s⁻¹

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

A straight line

A horizontal line

A curve

No relation

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

Spectrophotometry

Manometry

Titration

Gravimetric analysis

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

L²/mol²/s

L/mol/s

mol/L/s

s⁻¹

10. Which statement is true for a catalyst?

Becomes part of product

Increases reaction rate

Increases yield

Changes equilibrium position

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

They dissolve better

They have higher mass

They have more color

They have greater surface area

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

First

Zero

Third

Second

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

Barometer

Gas syringe

Spectroscope

Thermometer

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

Second-order

Zero-order

Third-order

First-order

15. How does temperature affect the rate of reaction?

Has no effect

Only affects physical changes

Increases particle collisions and reaction rate

Slows it down

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

Titration only

Colorimetry only

Solubility test

Initial rate method

17. What does a high rate of reaction indicate?

The reaction is slow

Reactants are converting to products quickly

Few molecules are reacting

The reactants are stable

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

Must be determined experimentally

Includes only rate constant

Depends only on products

Derived from balanced equation

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

ln[A] vs time

[A] vs time

1/[A] vs time

ln[A]² vs time

20. What is meant by molecularity of a reaction?

Moles of reactants

Total number of molecules in the system

Number of molecules involved in an elementary step

Number of atoms in the product

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

Have no effect

Halve the rate

Triple the rate

Double the rate

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

Chromatography

Manometer

Thermometry

Spectrophotometry

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

Light

Pressure

Concentration

Catalyst

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

No catalyst involved

One reactant is in large excess

Reaction is zero-order

All reactants are present in equal amounts

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

Pseudo-first-order

Zero-order

First-order

Second-order

Page 2 of 2

26. When a catalyst is used, what changes?

Products formed

Reactant concentrations

Enthalpy of reaction

Activation energy

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

It depends on the product

It usually increases

It remains unchanged

It decreases

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

29. How does a catalyst affect the activation energy?

Has no effect

Reduces it

Increases it

Eliminates it

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

s⁻¹

L/mol/s

mol/s

mol/L

31. Which order reaction is independent of concentration?

Zero

Second

First

Third

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

[A] vs time

ln(rate) vs time

ln[A] vs time

1/[A] vs time

33. Which reaction has the slowest rate?

Explosion

Rusting of iron

Combustion of methane

Strong acid + base

34. Which reaction occurs faster?

Cold + solid

Cold + liquid

Room temp + block

Hot + powder

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

mol/L

mol/s

s⁻¹

L/mol/s

36. What is the order of reaction?

Number of atoms in a molecule

Sum of powers of reactants in rate law

Time taken for reaction

Number of products formed

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

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

Increases it

Decreases it

Affects only gases

No effect

39. Which of the following best defines activation energy?

Heat of the product

Energy released in a reaction

Energy lost as heat

Energy required to start a reaction

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

Increased concentration

Lower pressure

Less temperature

Decreased surface area

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

[A] vs time is a straight line

1/[A] vs time is a straight line

ln[A] vs time is a straight line

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

42. The reaction rate is usually measured in:

L/s

mol/L

mol/s

mol

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

Decreases

Increases

Becomes zero

Remains constant

44. Which factor increases reaction rate in gaseous reactions?

Decreasing temperature

Reducing pressure

Increasing pressure

Removing heat

45. What is the rate of a chemical reaction?

The mass of reactants

The color change during reaction

The speed at which products form or reactants are consumed

The energy change in the reaction

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

The equilibrium constant

The proportionality factor in rate equation

The energy required

The change in volume

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

Time for maximum rate

Time until equilibrium

Time taken for 50% of reactant to react

Time taken to double the reactant

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

Time

Concentration

Pressure

Temperature

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

mol/L

mol/L/s

mol

L/mol/s

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

Thermometer

Manometer

Spectrometer

pH meter

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Mustansar KhanLast Updated: October 14, 2025

Important Chemistry Reaction Kinetics Question and Answer

MDCAT Chemistry Reaction Kinetics Practice Test Online With Explanation

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