This set of Engineering Chemistry Multiple Choice Questions & Answers (MCQs) focuses on “Catalysts”.
1. Which of the following is not a characteristic of a catalyst?
a) It participates in the reaction
b) It enhances the equilibrium rate
c) It activates equilibrium
d) It initialises the reaction
View Answer
Explanation: The main purpose of using a catalyst is only to increase the rate of achieving the equilibrium state in case of slow reaction. Other than that it will not initiate or involve in the reaction.
2. Which of the following will decrease the rate of reaction?
a) Catalytic poison
b) Positive catalyst
c) Negative catalyst
d) Catalytic promoters
View Answer
Explanation: Negative catalyst is used to slow down the reaction in order to avoid explosion when the temperature or pressure increases the critical value. Hence negative catalysts are used such as phosphoric acid.
3. Which of the following is a catalytic poison?
a) Potassium nitrate
b) Aluminium nitrate
c) Aluminium oxide
d) Chlorine
View Answer
Explanation: Aluminium oxide is known for its sophisticated properties and is mainly used in the process of corrosion preventing it absorbs moisture and has high retentivity and hence is used as a catalytic poison.
4. Which of the following is used as a catalytic promoter?
a) Chlorine
b) Nitrate
c) Bromine
d) Helium
View Answer
Explanation: The use of a promoter is to increase the rate of equilibrium. We know that nitrogen has promoting properties in the case of nitrate molecules. Thus the can act as good promoters in reaction.
5. Which of the following is used as a catalyst for the following reaction?
2SO2 + O2 ⟶ 2SO3
a) Chlorine
b) Nitrous oxide
c) Sulphur di oxide
d) Potassium chloride
View Answer
Explanation: Since sulphur and nitrogen components have the same equilibrium valencies, we can see that one will promote the other and vice versa. Thus nitrogen molecule is the best for sulphur molecules.
6. Which of the following is used as a catalyst for the following reaction?
N2 + 3H2 ⟶ 2NH3
a) Zinc
b) Chlorine
c) Platinum
d) Water
View Answer
Explanation: Since nitrogen and noble metals components have the same equilibrium valencies, we can see that one will promote the other and vice versa. Thus nitrogen molecule is the best for platinum molecules.
7. Which of the following is used as a catalyst for the following reaction?
H2O2 ⟶ 2H2O + O2
a) Chlorine
b) Bromine
c) Platinum
d) Noble solutions
View Answer
Explanation: Since oxygen and noble metals components have same equilibrium valencies, we can see that one will promote the other and vice versa. Thus oxygen molecule is the best for platinum molecules.
8. Which of the following is used as a catalytic poison for the same reaction:
SO2 + O2 ⟶ 2SO3
a) Platinum
b) Bromine
c) Magnesium
d) Silver
View Answer
Explanation: Though nitrogen is used as a promoter, we can see that platinum reduces its activity and hence decreases the rate of reaction of equilibrium in the above reaction.
9. Where is the intermediate theory used?
a) Heterogeneous components
b) Homogeneous components
c) Miscible components
d) Immiscible components
View Answer
Explanation: Intermediate theory is the process in which an intermediate product is formed and hence it is suitable for homogeneous components and not for heterogeneous components.
10. Calculate the amount of intermediate components formed from the given data.
S=12
T=10
C=12
a) 1
b) 0
c) 2
d) 10
View Answer
Explanation: we know that the amount of intermediate components formed is given by the formula s*c/12. So here we have 12*10/12=10.
Sanfoundry Global Education & Learning Series – Engineering Chemistry.
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