Live Education Quiz

1

Milk turning into yogurt is an example of:

A Physical change B Enzyme catalyzed reaction C Diffusion D Evaporation

2

In collision theory, proper orientation means:

A Particles must collide head-on B Particles must be parallel C Particles must collide randomly D Particles must have same mass

3

Reaction rate can be measured by:

A Color change B Mass change C Gas volume D All of these

4

Which factor has no effect on enzyme activity?

A pH B Temperature C Substrate concentration D Color of enzyme

5

Which process shows diffusion?

A Rusting B Perfume spreading in air C Burning D Freezing

6

Which unit is commonly used for reaction rate?

A mol B mol dm⁻³ s⁻¹ C dm³ D second

7

Which substance speeds up a reaction without being consumed?

A Reactant B Product C Catalyst D Solvent

8

Diffusion occurs fastest in:

A Solids B Liquids C Gases D Plasma

9

Enzyme-substrate complex is formed during:

A Physical change B Chemical reaction C Diffusion D Evaporation

10

Activation energy is defined as:

A Energy released during reaction B Minimum energy required for reaction C Energy of products D Total energy of reactants

11

Which condition can denature enzymes?

A Low pressure B Optimal pH C High temperature D Presence of substrate

12

Chemical kinetics helps in food preservation by:

A Speeding up spoilage B Slowing down reactions C Changing nutrients D Adding colors

13

Which of the following is an example of a catalyst?

A Iron in Haber process B Water C Oxygen D Carbon dioxide

14

Which term describes energy barrier of a reaction?

A Kinetic energy B Potential energy C Activation energy D Thermal energy

15

Collision theory applies mainly to reactions in:

A Solid state B Gaseous state C Plasma state D Vacuum

16

Chemical kinetics helps the food industry mainly by:

A Improving taste B Controlling reaction speed C Changing color D Increasing weight

17

A catalyst increases reaction rate by:

A Increasing activation energy B Decreasing activation energy C Being consumed D Changing products

18

What is meant by the rate of a chemical reaction?

A Amount of catalyst used B Time taken for completion C Change in concentration per unit time D Temperature of reaction

19

For a collision to be effective, particles must have:

A Large size B Same color C Sufficient energy D High density

20

Which reaction condition increases enzyme efficiency?

A Extreme pH B Optimal temperature C High pressure D Low substrate

Unit#5: Reaction Kinetics