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

s⁻¹

L/mol/s

mol/s

mol/L

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

Pressure

Light

Catalyst

Concentration

3. 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

4. Which order reaction is independent of concentration?

Zero

Third

First

Second

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

Triple the rate

Have no effect

Halve the rate

Double the rate

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

mol/L

L/mol/s

mol/L/s

mol

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

The energy required

The change in volume

The proportionality factor in rate equation

The equilibrium constant

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

Molecular weight

Temperature

Surface area

Pressure

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

Volume of gases

Change in temperature

Concentration at specific times

Rate at the beginning of reaction

10. Which reaction occurs faster?

Cold + solid

Room temp + block

Hot + powder

Cold + liquid

11. When a catalyst is used, what changes?

Activation energy

Enthalpy of reaction

Products formed

Reactant concentrations

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

Thermometry

Spectrophotometry

Chromatography

Manometer

13. Which factor increases reaction rate in gaseous reactions?

Reducing pressure

Increasing pressure

Decreasing temperature

Removing heat

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

[A] vs time

1/[A] vs time

ln[A] vs time

ln(rate) vs time

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

A straight line

A curve

No relation

A horizontal line

16. 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 [A] is a straight line

ln[A] vs time is a straight line

17. The reaction rate is usually measured in:

mol

L/s

mol/L

mol/s

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

Zero-order

Third-order

First-order

Second-order

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

Must be determined experimentally

Derived from balanced equation

Includes only rate constant

Depends only on products

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

pH meter

Thermometer

Manometer

Spectrometer

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

Spectroscope

Gas syringe

Barometer

Thermometer

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

mol/L/s

L/mol/s

s⁻¹

L²/mol²/s

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

24. What is the order of reaction?

Number of products formed

Sum of powers of reactants in rate law

Time taken for reaction

Number of atoms in a molecule

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

ln[A] vs time

[A] vs time

ln[A]² vs time

1/[A] vs time

Page 2 of 2

26. What does a high rate of reaction indicate?

Reactants are converting to products quickly

The reactants are stable

The reaction is slow

Few molecules are reacting

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

Second

Third

Zero

First

28. Which reaction has the slowest rate?

Rusting of iron

Strong acid + base

Combustion of methane

Explosion

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

Pseudo-first-order

Zero-order

Second-order

First-order

30. Which statement is true for a catalyst?

Increases reaction rate

Increases yield

Changes equilibrium position

Becomes part of product

31. In zero-order reactions, rate is:

Constant

Very high

Proportional to square of concentration

Dependent on concentration

32. What is the rate of a chemical reaction?

The color change during reaction

The energy change in the reaction

The mass of reactants

The speed at which products form or reactants are consumed

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

All reactants are present in equal amounts

Reaction is zero-order

One reactant is in large excess

No catalyst involved

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

Zero

Second

Third

First

35. How does temperature affect the rate of reaction?

Increases particle collisions and reaction rate

Slows it down

Has no effect

Only affects physical changes

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

They have more color

They have higher mass

They dissolve better

They have greater surface area

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

Time

Concentration

Pressure

Temperature

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

mol/L/s

mol/s

L²/mol²/s

s⁻¹

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

Third-order

Second-order

First-order

Zero-order

40. How does a catalyst affect the activation energy?

Increases it

Has no effect

Eliminates it

Reduces it

41. 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

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

Time until equilibrium

Time taken to double the reactant

Time for maximum rate

Time taken for 50% of reactant to react

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

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

Spectrophotometry

Manometry

Titration

Gravimetric analysis

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

L/mol/s

s⁻¹

mol/L

mol/s

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

Decreases it

No effect

Increases it

Affects only gases

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

Decreased surface area

Lower pressure

Less temperature

Increased concentration

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

Colorimetry only

Solubility test

Initial rate method

Titration only

49. What is meant by molecularity of a reaction?

Number of molecules involved in an elementary step

Moles of reactants

Number of atoms in the product

Total number of molecules in the system

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

Increases

Decreases

Remains constant

Becomes zero

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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

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