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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.
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MDCAT Chemistry Reaction Kinetics Practice Test Online With Explanation

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1. In zero-order reactions, rate is:

Proportional to square of concentration

Constant

Very high

Dependent on concentration

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

Must be determined experimentally

Derived from balanced equation

Depends only on products

Includes only rate constant

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

[A] vs time

ln[A] vs time

1/[A] vs time

ln[A]² vs time

4. Which reaction has the slowest rate?

Rusting of iron

Explosion

Strong acid + base

Combustion of methane

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

6. What does a high rate of reaction indicate?

The reactants are stable

The reaction is slow

Reactants are converting to products quickly

Few molecules are reacting

7. Which of the following best defines activation energy?

Energy lost as heat

Heat of the product

Energy required to start a reaction

Energy released in a reaction

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

s⁻¹

mol/L

mol/s

L/mol/s

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

Pressure

Concentration

Time

Temperature

10. What is meant by molecularity of a reaction?

Number of molecules involved in an elementary step

Moles of reactants

Total number of molecules in the system

Number of atoms in the product

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

Concentration

Catalyst

Pressure

Light

12. How does temperature affect the rate of reaction?

Only affects physical changes

Increases particle collisions and reaction rate

Has no effect

Slows it down

13. When a catalyst is used, what changes?

Products formed

Enthalpy of reaction

Activation energy

Reactant concentrations

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

L²/mol²/s

mol/L/s

s⁻¹

L/mol/s

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

Thermometer

Spectroscope

Barometer

Gas syringe

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

Third-order

First-order

Second-order

Zero-order

17. What is the rate of a chemical reaction?

The color change during reaction

The mass of reactants

The speed at which products form or reactants are consumed

The energy change in the reaction

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

They have higher mass

They have greater surface area

They have more color

They dissolve better

19. 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

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

A curve

A straight line

A horizontal line

No relation

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

Third

Second

Zero

First

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

L/mol/s

s⁻¹

mol/s

mol/L

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

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

Pseudo-first-order

Zero-order

First-order

Second-order

25. 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

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

The change in volume

The proportionality factor in rate equation

The equilibrium constant

The energy required

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

Third-order

Second-order

First-order

Zero-order

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

Decreased surface area

Lower pressure

Increased concentration

Less temperature

29. Which factor increases reaction rate in gaseous reactions?

Removing heat

Decreasing temperature

Reducing pressure

Increasing pressure

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

Gravimetric analysis

Titration

Manometry

Spectrophotometry

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

Manometer

Spectrometer

Thermometer

pH meter

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

mol/s

L²/mol²/s

mol/L/s

s⁻¹

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

First

Zero

Second

Third

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

Have no effect

Triple the rate

Halve the rate

Double the rate

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

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

[A] vs time is a straight line

1/[A] vs time is a straight line

ln[A] vs time is a straight line

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

Spectrophotometry

Chromatography

Manometer

Thermometry

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

Remains constant

Decreases

Increases

Becomes zero

38. How does a catalyst affect the activation energy?

Eliminates it

Reduces it

Increases it

Has no effect

39. Which order reaction is independent of concentration?

First

Zero

Second

Third

40. Which reaction occurs faster?

Cold + solid

Room temp + block

Hot + powder

Cold + liquid

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

Reaction is zero-order

One reactant is in large excess

All reactants are present in equal amounts

No catalyst involved

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

Decreases it

No effect

Affects only gases

Increases it

43. 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

44. The reaction rate is usually measured in:

mol

mol/L

L/s

mol/s

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

Time until equilibrium

Time for maximum rate

Time taken for 50% of reactant to react

Time taken to double the reactant

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

mol/L/s

L/mol/s

mol/L

mol

47. 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

48. Which statement is true for a catalyst?

Changes equilibrium position

Increases reaction rate

Becomes part of product

Increases yield

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

Initial rate method

Colorimetry only

Solubility test

Titration only

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

Molecular weight

Temperature

Pressure

Surface area

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Mustansar KhanLast Updated: October 14, 2025

Chemistry Reaction Kinetics Online Mcqs Test

Important Chemistry Reaction Kinetics Question and Answer

MDCAT Chemistry Reaction Kinetics Practice Test Online With Explanation

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