Chemical Kinetics
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It has been found that for a chemical reaction with rise in temperature by 9K the rate constant gets doubled. Assuming a reaction to be occurring at 300 K, the value of activation energy is found to be________ kJ mol-1. (in nearest integer)
(Given: In 10 = 2.3, R = 8.3 JK-1 mol-1, log2 = 0.30)
It has been found that for a chemical reaction with rise in temperature by 9K the rate constant gets doubled. Assuming a reaction to be occurring at 300 K, the value of activation energy is found to be________ kJ mol-1. (in nearest integer)
(Given: In 10 = 2.3, R = 8.3 JK-1 mol-1, log2 = 0.30)
Initial temperature ; T1 = 300 K
Final temperature ; T2 = 309 K
Rate constant gets doubled i.e K2 = 2K1
Upvote 
Consider the reaction A⇌B. The concentration of both the reactants and the products varies exponentially with time. Which of the following figures correctly describes the change in concentration of reactants and products with time?
Consider the reaction A⇌B. The concentration of both the reactants and the products varies exponentially with time. Which of the following figures correctly describes the change in concentration of reactants and products with time?
This is a Fill in the blanks Type Question as classified in NCERT Exemplar
Ans: Correct option B
If A→B then the concentration of both reactants and the products vary exponentially with time. But, in option B graph the reactant concentration decreases exponentially and the product concentration i
Upvote The value of rate constant of a pseudo first order reaction ____________.
A. Depends on the concentration of reactants present in small amount
B. Depends on the concentration of reactants present in excess.
C. Is independent of the concentration of reactants.
D. Depends only on temperature.
The value of rate constant of a pseudo first order reaction ____________.
A. Depends on the concentration of reactants present in small amount
B. Depends on the concentration of reactants present in excess.
C. Is independent of the concentration of reactants.
D. Depends only on temperature.
This is a Fill in the blanks Type Question as classified in NCERT Exemplar
Ans: Correct option C
Let's start with what a pseudo-first-order response is.
Although the pseudo-first-order reaction looks to be an order, it belongs to another order. It's a second-order reaction because it involves two react
Upvote Which of the following statements is not correct for the catalyst?
A. It catalyses the forward and backward reaction to the same extent.
B. It alters ∆G of the reaction.
C. It is a substance that does not change the equilibrium constant of a reaction.
D. It provides an alternate mechanism by reducing activation energy between reactants and products
Which of the following statements is not correct for the catalyst?
A. It catalyses the forward and backward reaction to the same extent.
B. It alters ∆G of the reaction.
C. It is a substance that does not change the equilibrium constant of a reaction.
D. It provides an alternate mechanism by reducing activation energy between reactants and products
This is a Fill in the blanks Type Question as classified in NCERT Exemplar
Correct option C
In the presence of a catalyst, the value of ΔG cannot be changed for any reaction.
ΔG=−RtlnQ
Where Q is the Reaction Quotient, which is determined by the product and reactant concentration
Upvote Which of the following statements is not correct for the catalyst?\
A. It catalyses the forward and backward reaction to the same extent.
B. It alters ∆G of the reaction.
C. It is a substance that does not change the equilibrium constant of a reaction.
D. It provides an alternate mechanism by reducing activation energy between reactants and products
Which of the following statements is not correct for the catalyst?\
A. It catalyses the forward and backward reaction to the same extent.
B. It alters ∆G of the reaction.
C. It is a substance that does not change the equilibrium constant of a reaction.
D. It provides an alternate mechanism by reducing activation energy between reactants and products
This is a Fill in the blanks Type Question as classified in NCERT Exemplar
Ans: Correct option C
In the presence of a catalyst, the value of ΔG cannot be changed for any reaction.
ΔG=−RtlnQ
Where Q is the Reaction Quotient, which is determined by the product and reactant con
Upvote Compounds ‘A’ and ‘B’ react according to the following chemical equation.
A[g] + 2B[g]→2C
Concentration of either ‘A’ or ‘B’ were changed keeping the concentrations of one of the reactants constant and rates were measured as a function of initial concentration. Following results were obtained. Choose the correct option for the rate equations for this reaction.
A. Rate = k[A] 2[B]
B. Rate = k[A][B]2
C. Rate = k[A][B]
D. Rate = k[A]2[B]0
Compounds ‘A’ and ‘B’ react according to the following chemical equation.
A[g] + 2B[g]→2C
Concentration of either ‘A’ or ‘B’ were changed keeping the concentrations of one of the reactants constant and rates were measured as a function of initial concentration. Following results were obtained. Choose the correct option for the rate equations for this reaction.
This is a Fill in the blanks Type Question as classified in NCERT Exemplar
Ans: Correct option B
Let order of A and B be x and y.
r = k [A]x [B]y
0.1 = k (0.3)x (0.3)y_______1
0.4 = 0.1 = k (0.3)x (0.6)y_______2
0.2 = 0.1 = k (0.6)x (0.3)y______3
Divide 2 by 1
=
Divide 3 by 1
=
Hence R
Upvote A first order reaction is 50% completed in 1.26 ×1014s. How much time would it take for 100% completion?
A. 1.26 ×1015s
B. 2.52 ×1014s
C. 2.52 ×1028s
D. Infinite
A first order reaction is 50% completed in 1.26 ×1014s. How much time would it take for 100% completion?
A. 1.26 ×1015s
B. 2.52 ×1014s
C. 2.52 ×1028s
D. Infinite
This is a Fill in the blanks Type Question as classified in NCERT Exemplar
Ans: Correct option D
Note. It is not possible to perform 100% of the reaction because is half-life
Basically, it is called half-line period of the reaction. So, the time taken for 100% completion of the reaction is infinite.
Upvote Which of the following statements is incorrect about the collision theory of chemical reaction?
A. It considers reacting molecules or atoms to be hard spheres and ignores their structural features.
B. Number of effective collisions determines the rate of reaction.
C. Collision of atoms or molecules possessing sufficient threshold energy results into the product formation.
D. Molecules should collide with sufficient threshold energy and proper orientation for the collision to be effective.
Which of the following statements is incorrect about the collision theory of chemical reaction?
A. It considers reacting molecules or atoms to be hard spheres and ignores their structural features.
B. Number of effective collisions determines the rate of reaction.
C. Collision of atoms or molecules possessing sufficient threshold energy results into the product formation.
D. Molecules should collide with sufficient threshold energy and proper orientation for the collision to be effective.
This is a Fill in the blanks Type Question as classified in NCERT Exemplar
Ans: Correct option C
In the case of gases, collision theory is used to predict the speeds of chemical processes. According to this idea, the reacting chemicals must collide with enough energy and in the right direction. The mo
Upvote Rate law for the reaction A + 2B→C is found to be
Rate = k[A][B]
Concentration of reactant ‘B’ is doubled, keeping the concentration of ‘A’ constant, the value of rate constant will be______.
A. The same
B. Doubled
C. Quadrupled
D. Halved
Rate law for the reaction A + 2B→C is found to be
Rate = k[A][B]
Concentration of reactant ‘B’ is doubled, keeping the concentration of ‘A’ constant, the value of rate constant will be______.
A. The same
B. Doubled
C. Quadrupled
D. Halved
This is a Fill in the blanks Type Question as classified in NCERT Exemplar
Ans: Correct option A
The rate concentration of a reaction does not depend upon concentrations of the reactions. Hence, it will remain the same. Even if the equation shows the double concentration level even the rate conce
Upvote Which of the following graphs represents exothermic reaction?
A. (a) only
B. (b) only
C. (c) only
D. (a) and (b) only
Which of the following graphs represents exothermic reaction?
D. (a) and (b) only
This is a Fill in the blanks Type Question as classified in NCERT Exemplar
Ans: Correct option A
Exothermic Reaction: Exothermic reaction is a chemical reaction in which the enthalpy change is negative, and energy is released in the form of light and heat.
As we all know, ΔH is negative.
Activation
Upvote