Catalyst And Catalysis(General Knowledge > General Science ) Questions and answers for exam Preparation

Question 1. How does a catalyst work in speeding up a reaction?

By lowering the activation energy or reaction
by giving them more energy
by making them more available
All of above

Explanation:-

Answer: Option A. -> By lowering the activation energy or reaction

Question 2. A catalyst is __________-specific

Radioactive
Reactive
Reaction
None of these

Explanation:-

Answer: Option C. -> Reaction

Question 3. Enzymes in your body probably work best at which of the following temperatures>

25oC
37oC
98oC
100oC

Explanation:-

Answer: Option B. -> 37oC

Question 4. A ______________ is a substance that increases the rate of a reaction without being used up during the reaction

catalyst
reactant
product
solute

Explanation:-

Answer: Option A. -> catalyst

Question 5. Catalysts may be in the state of ___________

Solid and liquid only
Liquid and gases only
Solid and gases only
Solid, liquid or gases

Explanation:-

Answer: Option D. -> Solid, liquid or gases

Question 6. What happen to the rate of reaction when a catalyst is added to it?

Increases
Decreases
Nothing changes
All of above

Explanation:-

Answer: Option A. -> Increases

Question 7. What do you call the energy that is required to start a reaction?

Alternative energy
Activation energy
Atmospheric energy
None of these

Explanation:-

Answer: Option B. -> Activation energy

Question 8. What does catalyst do to a reaction?

Slows down the reaction
Nothing changes
Speeds up the reaction
All of above

Explanation:-

Answer: Option C. -> Speeds up the reaction

Question 9. A catalyst changes the mechanism of the reaction

True
False

Explanation:-

Answer: Option A. -> True

Question 10. A catalyst increases the efficiency of collisions between reactants

true
false

Explanation:-

Answer: Option A. -> true