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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.
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MDCAT Chemistry Reaction Kinetics Test

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Page 1 of 2

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

ln[A] vs time

ln(rate) vs time

1/[A] vs time

[A] vs time

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

A horizontal line

A straight line

A curve

No relation

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

Second-order

Pseudo-first-order

Zero-order

First-order

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

Colorimetry only

Titration only

Initial rate method

Solubility test

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

Time

Concentration

Pressure

Temperature

6. When a catalyst is used, what changes?

Products formed

Enthalpy of reaction

Reactant concentrations

Activation energy

7. What does a high rate of reaction indicate?

Reactants are converting to products quickly

Few molecules are reacting

The reaction is slow

The reactants are stable

8. How does temperature affect the rate of reaction?

Only affects physical changes

Has no effect

Increases particle collisions and reaction rate

Slows it down

9. Which order reaction is independent of concentration?

First

Third

Second

Zero

10. Which factor increases reaction rate in gaseous reactions?

Increasing pressure

Removing heat

Reducing pressure

Decreasing temperature

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

pH meter

Manometer

Thermometer

Spectrometer

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

Depends only on products

Must be determined experimentally

Includes only rate constant

Derived from balanced equation

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

s⁻¹

mol/L

L/mol/s

mol/s

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

Light

Pressure

Catalyst

Concentration

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

Decreases it

Increases it

Affects only gases

No effect

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

L/mol/s

mol/s

s⁻¹

mol/L

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

mol/L/s

mol/s

L²/mol²/s

s⁻¹

18. 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

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

Second-order

First-order

Third-order

Zero-order

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

1/[A] vs time

ln[A]² vs time

[A] vs time

ln[A] vs time

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

Time taken for 50% of reactant to react

Time until equilibrium

Time for maximum rate

Time taken to double the reactant

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

Triple the rate

Have no effect

Double the rate

Halve the rate

23. What is the rate of a chemical reaction?

The mass of reactants

The energy change in the reaction

The color change during reaction

The speed at which products form or reactants are consumed

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

The equilibrium constant

The proportionality factor in rate equation

The change in volume

The energy required

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

Spectroscope

Gas syringe

Barometer

Thermometer

Page 2 of 2

26. In zero-order reactions, rate is:

Dependent on concentration

Proportional to square of concentration

Very high

Constant

27. Which of the following best defines activation energy?

Energy released in a reaction

Heat of the product

Energy lost as heat

Energy required to start a reaction

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

ln[A] vs time is a straight line

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

1/[A] vs time is a straight line

[A] vs time is a straight line

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

L/mol/s

L²/mol²/s

s⁻¹

mol/L/s

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

Zero-order

First-order

Third-order

Second-order

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

Less temperature

Increased concentration

Decreased surface area

Lower pressure

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

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

First

Second

Zero

Third

34. The reaction rate is usually measured in:

mol/s

mol/L

L/s

mol

35. Which reaction has the slowest rate?

Explosion

Combustion of methane

Strong acid + base

Rusting of iron

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

They have higher mass

They have more color

They dissolve better

They have greater surface area

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

Zero

First

Third

Second

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

mol/L/s

mol

L/mol/s

mol/L

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

Reaction is zero-order

All reactants are present in equal amounts

One reactant is in large excess

No catalyst involved

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

Manometry

Titration

Gravimetric analysis

Spectrophotometry

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

Temperature

Surface area

Pressure

Molecular weight

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

43. How does a catalyst affect the activation energy?

Has no effect

Increases it

Reduces it

Eliminates it

44. Which reaction occurs faster?

Cold + liquid

Room temp + block

Hot + powder

Cold + solid

45. What is meant by molecularity of a reaction?

Moles of reactants

Number of molecules involved in an elementary step

Number of atoms in the product

Total number of molecules in the system

46. Which statement is true for a catalyst?

Changes equilibrium position

Increases reaction rate

Becomes part of product

Increases yield

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

It decreases

It usually increases

It remains unchanged

It depends on the product

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

Remains constant

Becomes zero

Decreases

Increases

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

Change in temperature

Volume of gases

Rate at the beginning of reaction

Concentration at specific times

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

Thermometry

Manometer

Chromatography

Spectrophotometry

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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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