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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. How does a catalyst affect the activation energy?

Reduces it

Has no effect

Increases it

Eliminates it

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

Third-order

First-order

Second-order

Zero-order

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

Zero

Third

Second

First

4. Which reaction occurs faster?

Hot + powder

Cold + liquid

Cold + solid

Room temp + block

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

No catalyst involved

One reactant is in large excess

All reactants are present in equal amounts

Reaction is zero-order

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

Time for maximum rate

Time until equilibrium

Time taken to double the reactant

Time taken for 50% of reactant to react

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

Solubility test

Colorimetry only

Titration only

Initial rate method

8. How does temperature affect the rate of reaction?

Slows it down

Increases particle collisions and reaction rate

Only affects physical changes

Has no effect

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

Increased concentration

Lower pressure

Decreased surface area

Less temperature

10. Which order reaction is independent of concentration?

Third

Zero

First

Second

11. Which reaction has the slowest rate?

Combustion of methane

Rusting of iron

Explosion

Strong acid + base

12. In zero-order reactions, rate is:

Proportional to square of concentration

Dependent on concentration

Very high

Constant

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

Increases

Becomes zero

Remains constant

Decreases

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

mol/L

mol

mol/L/s

L/mol/s

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

Double the rate

Triple the rate

Halve the rate

Have no effect

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

Chromatography

Thermometry

Spectrophotometry

Manometer

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

It depends on the product

It remains unchanged

It decreases

It usually increases

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

Manometer

Thermometer

Spectrometer

pH meter

19. The reaction rate is usually measured in:

mol/L

mol/s

mol

L/s

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

Temperature

Time

Pressure

Concentration

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

Gas syringe

Barometer

Thermometer

Spectroscope

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

s⁻¹

mol/L

mol/s

L/mol/s

23. When a catalyst is used, what changes?

Products formed

Enthalpy of reaction

Reactant concentrations

Activation energy

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

1/[A] vs time is a straight line

[A] vs time is a straight line

ln[A] vs time is a straight line

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

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

A curve

No relation

A horizontal line

A straight line

Page 2 of 2

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

Rate at the beginning of reaction

Concentration at specific times

Volume of gases

Change in temperature

27. Which statement is true for a catalyst?

Changes equilibrium position

Increases yield

Becomes part of product

Increases reaction rate

28. What is the rate of a chemical reaction?

The energy change in the reaction

The speed at which products form or reactants are consumed

The mass of reactants

The color change during reaction

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

Catalyst

Concentration

Light

Pressure

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

Pseudo-first-order

First-order

Second-order

Zero-order

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

mol/L/s

mol/s

L²/mol²/s

s⁻¹

32. What does a high rate of reaction indicate?

The reactants are stable

Reactants are converting to products quickly

Few molecules are reacting

The reaction is slow

33. Which factor increases reaction rate in gaseous reactions?

Increasing pressure

Reducing pressure

Removing heat

Decreasing temperature

34. What is meant by molecularity of a reaction?

Number of atoms in the product

Number of molecules involved in an elementary step

Total number of molecules in the system

Moles of reactants

35. Which of the following best defines activation energy?

Energy lost as heat

Heat of the product

Energy released in a reaction

Energy required to start a reaction

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

Derived from balanced equation

Must be determined experimentally

Depends only on products

Includes only rate constant

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

The equilibrium constant

The change in volume

The proportionality factor in rate equation

The energy required

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

No effect

Affects only gases

Decreases it

Increases it

39. 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

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

They have higher mass

They have greater surface area

They dissolve better

They have more color

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

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

Zero-order

First-order

Third-order

Second-order

43. What is the order of reaction?

Sum of powers of reactants in rate law

Time taken for reaction

Number of products formed

Number of atoms in a molecule

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

Titration

Gravimetric analysis

Manometry

Spectrophotometry

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

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

Pressure

Molecular weight

Surface area

Temperature

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

First

Second

Zero

Third

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

s⁻¹

L/mol/s

mol/L/s

L²/mol²/s

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

s⁻¹

L/mol/s

mol/s

mol/L

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

[A] vs time

ln[A]² vs time

ln[A] vs time

1/[A] vs time

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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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