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MDCAT Chemistry Reaction Kinetics Test Online

Mustansar KhanLast Updated: May 26, 2025

Chemistry Reaction Kinetics MCQS Online Test

MDCAT Chemistry Reaction Kinetics Chapter Online Test

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:	MDCAT Entry Test Chemistry Online Test Interview Questions about Chemisttry All Universities Entrance Test Recruitments Tests

MDCAT Chemistry Reaction Kinetics Test

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Page 1 of 2

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

The proportionality factor in rate equation

The change in volume

The energy required

The equilibrium constant

2. Which of the following best defines activation energy?

Energy lost as heat

Energy required to start a reaction

Heat of the product

Energy released in a reaction

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

Colorimetry only

Solubility test

Initial rate method

Titration only

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

pH meter

Manometer

Thermometer

Spectrometer

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

mol/L/s

mol

L/mol/s

mol/L

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

s⁻¹

L²/mol²/s

mol/L/s

mol/s

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

mol/s

s⁻¹

L/mol/s

mol/L

8. Which reaction occurs faster?

Cold + liquid

Room temp + block

Cold + solid

Hot + powder

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

Decreased surface area

Increased concentration

Lower pressure

Less temperature

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

Temperature

Surface area

Pressure

Molecular weight

11. When a catalyst is used, what changes?

Reactant concentrations

Enthalpy of reaction

Products formed

Activation energy

12. 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

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

They have higher mass

They dissolve better

They have greater surface area

They have more color

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

Third-order

Zero-order

Second-order

First-order

15. Which reaction has the slowest rate?

Rusting of iron

Strong acid + base

Combustion of methane

Explosion

16. Which factor increases reaction rate in gaseous reactions?

Removing heat

Decreasing temperature

Reducing pressure

Increasing pressure

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

1/[A] vs time

ln[A]² vs time

ln[A] vs time

[A] vs time

18. In zero-order reactions, rate is:

Dependent on concentration

Very high

Constant

Proportional to square of concentration

19. Which order reaction is independent of concentration?

Zero

First

Third

Second

20. How does temperature affect the rate of reaction?

Only affects physical changes

Has no effect

Increases particle collisions and reaction rate

Slows it down

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

It decreases

It remains unchanged

It usually increases

It depends on the product

22. 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

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

mol/s

mol/L

L/mol/s

s⁻¹

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

25. How does a catalyst affect the activation energy?

Reduces it

Increases it

Eliminates it

Has no effect

Page 2 of 2

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

Zero

Third

Second

First

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

Gravimetric analysis

Manometry

Spectrophotometry

Titration

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

A straight line

A horizontal line

A curve

No relation

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

Decreases it

Affects only gases

No effect

Increases it

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

Second

Zero

Third

First

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

Zero-order

First-order

Third-order

Second-order

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

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

Barometer

Spectroscope

Thermometer

Gas syringe

34. What is meant by molecularity of a reaction?

Number of atoms in the product

Total number of molecules in the system

Moles of reactants

Number of molecules involved in an elementary step

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

Depends only on products

Includes only rate constant

Must be determined experimentally

Derived from balanced equation

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

Pseudo-first-order

Zero-order

First-order

Second-order

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

Pressure

Temperature

Concentration

Time

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

mol/L/s

L/mol/s

s⁻¹

L²/mol²/s

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

Concentration at specific times

Volume of gases

Change in temperature

Rate at the beginning of reaction

40. The reaction rate is usually measured in:

mol/s

mol

mol/L

L/s

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

ln[A] vs time is a straight line

[A] vs time is a straight line

1/[A] vs time is a straight line

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

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

Time for maximum rate

Time taken to double the reactant

Time taken for 50% of reactant to react

Time until equilibrium

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

Decreases

Becomes zero

Increases

Remains constant

44. Which statement is true for a catalyst?

Increases yield

Changes equilibrium position

Becomes part of product

Increases reaction rate

45. What is the order of reaction?

Time taken for reaction

Number of products formed

Number of atoms in a molecule

Sum of powers of reactants in rate law

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

Pressure

Concentration

Catalyst

Light

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

Double the rate

Triple the rate

Have no effect

Halve the rate

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

ln(rate) vs time

[A] vs time

ln[A] vs time

1/[A] vs time

49. What does a high rate of reaction indicate?

The reaction is slow

Reactants are converting to products quickly

The reactants are stable

Few molecules are reacting

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

Thermometry

Spectrophotometry

Manometer

Chromatography

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Mustansar KhanLast Updated: May 26, 2025

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MDCAT Chemistry Reaction Kinetics Test Online

Chemistry Reaction Kinetics MCQS Online Test

MDCAT Chemistry Reaction Kinetics Chapter Online Test

MDCAT Chemistry Reaction Kinetics Test

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Chemistry Reaction Kinetics MCQS Online Test

MDCAT Chemistry Reaction Kinetics Chapter Online Test

MDCAT Chemistry Reaction Kinetics Test

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