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First Order Reaction MCQ - Practice Questions with Answers
Edited By admin | Updated on Sep 25, 2023 25:23 PM | #NEET
Quick Facts
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First Order Reaction, Half Life of First Order Reaction, Graphs of First Order Kinetics are considered the most difficult concepts.
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77 Questions around this concept.
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can be taken as the time taken for the concentration of a reactant to drop to 3/4 of its initial value. If the rate constant for a first order reaction is
the
can be written as
The rate equation for the reaction is found to be : rate
The correct statement in relation to this reaction is that the
The half-life period of a first-order reaction is 15 minutes. The amount of substance left after one hour will be :
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Units of the rate constant of first and zero-order reactions in terms of molarity M unit are respectively.
Select the reaction which is not follows the first order Kinetics:
If we start a reaction from 100 mol, having the rate constant is . What will be the rate of the reaction offer 20 min.
Which of the following reactions is first order reaction
Which of the following correctly represents the first order reaction.
Which expression is not correctly represent the first order reaction?
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Download EBookConsider a reaction follow the first-order kinetics with a rate constant
. What percentage of A will be left after after 5 half-lives?
Concepts Covered - 4
First Order Reaction
The rate of the reaction is proportional to the first power.
The chemical reaction occurs as follows:
R P
a 0
a-x x
We have,
[differentiate rate law]
Unit of
Other Forms of Rate Law
We know that the first-order equation is given as follows:
But there are other forms of rate law also available that we use for different purposes. These forms are mentioned below:
- Use to solve numericals:
- Exponential form:
This equation is also known as exponential form.
Half Life of First Order Reaction
The half-life of a reaction is the time in which the concentration of a reactant is reduced to one half of its initial concentration. It is represented as t1/2.
For a zero order reaction, rate constant is given as:
The rate constant at t1/2 becomes:
It is clear that t1/2 for a zero order reaction is directly proportional to the initial concentration of the reactants and inversely proportional to the rate constant.
For the first order reaction,
So, the above equation becomes
Graphs of First Order Kinetics
Study it with Videos
First Order Reaction
Other Forms of Rate Law
Half Life of First Order Reaction
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