1. Addition of MnO2 (a catalyst) to the following reaction causes all of the fol
ID: 1084960 • Letter: 1
Question
1. Addition of MnO2 (a catalyst) to the following reaction causes all of the following to be true EXCEPT:
2. Which of the following statements is/are true about reaction mechanisms?
I. A rate law can be written from the slow elementary step.
II. The rate law of the overall reaction can include intermediates.
III. The rate of the overall reaction is dependent on the fastest step in the mechanism.
The half-life increases The energy of activation decreases for the reaction. The rate of the reaction increases. The amount of MnO2 doesn't change during the reaction.Explanation / Answer
1.
All the statements are true except the first statement which says that the half life increases. The half life doesnot increase, it decreases in the presence of catalyst because the rate of reaction increases so it will take take less time for the reactant to be consumed to half of its initial value.
Activation energy decreases in the presence of catalyst that why rate of reaction increases. The amount of catalyst doesnot change during the reaction.
2.
1 only is true.
Rate law is written only from the slowest step of the reaction. The slowest step is also called the rate determining step.
Rate law doesnot include intermediates because rate doesnot depend upon intermediates because they only form during the reaction and gets converted to products.
Rate of the reaction doesnot depend upon fastest step because rate is determined only from the slowest step of the reaction mechanism.
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.