Topic: Chemical Kinetics, Test No.: 04, Total MCQs: 15
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Question 1 |
Which of the following statements for order of reaction is not correct? [IIT JEE 2005]
Order can be determined experimentally | |
Order of a reaction is equal to the sum of the power of concentration terms in differential rate law | |
It is not affected with the stoichiometric coefficients of the reactants | |
Order cannot be fractional |
Question 2 |
The rate of reaction between two reactants A and B decreases by a factor of 4 if the concentration of reactant B is doubled. The order of reaction with respect to reactant B is [CBSE AIPMT 2005]
2 | |
–2 | |
1 | |
–1 |
Question 3 |
A reaction involving two different reactants can never be [AIEEE 2005]
Unimolecular reaction | |
First order reaction | |
Second order reaction | |
Bimolecular reaction |
Question 4 |
Consider an endothermic reaction, X → Y with activation energies Eb and Ef respectively for the backward and forward reactions, respectively. In general, [AIEEE 2005]
Eb < Ef | |
Eb > Ef | |
Eb = Ef | |
there is no definite relation between Eb and Ef |
Question 5 |
t1/4 can be taken as the time taken for the concentration of a reactant to drop to 3/4 of its initial value. If rate constant for a first order reaction is k, then t1/4 can be written as [AIEEE 2005]
0.01/k | |
0.29/k | |
0.69/k | |
0.75/k |
Question 6 |
A follows first order reaction, (A) → product
Concentration of A, changes from 0.1 M to 0.025 M in 40 minutes. Find the rate of reaction of A when concentration of A is 0.01 M. [IIT JEE 2004]
1.73 × 10–4 M min–1 | |
3.47 × 10–5 M min–1 | |
3.47 × 10–4 M min–1 | |
1.73 × 10–5 M min–1 |
Question 7 |
The rate of a first order reaction is
1.5 × 10–2 mol L–1 min–1 at 0.5 M concentration of the reactant. The half life of the reaction is [CBSE AIPMT 2004]
23.1 min | |
8.73 min | |
7.53 min | |
0.383 min |
Question 8 |
In a first order reaction, the concentration of the reactant decreases from 0.8 M to 0.4 M in 15 minutes. The time taken for the concentration to change from 0.1 M to 0.025 M is [AIEEE 2004]
7.5 min | |
15 min | |
30 min | |
60 min |
Question 9 |
The rate equation for the reaction:
2A + B → C is found to be: rate = k [A] [B]. The correct statement in relation to this reaction is that the [AIEEE 2004]
units of k must be s–1 | |
t1/2 is constant | |
rate of formation of C is twice the rate of disappearance of A | |
value of k is independent of the initial concentration of A and B. |
Question 10 |
The velocity
constant of a reaction at 290° K was found to be
3.2 × 10–3 S–1. When the temperature is raised to 310°
K, it will be about: [Karnataka CET 2004]
9.6 × 10–3 | |
1.28 × 10–2 | |
6.4 × 10–3 | |
3.2 × 10–4 |
Question 11 |
The reaction: A → B follows first order kinetics. The time taken for 0.8 mol of A to produce 0.6 mol of B is 1 hour. What is the time taken for conversion of 0.9 mol of A to produce 0.675 mol of B? [CBSE AIPMT 2003]
1 hour | |
0.5 hour | |
0.25 hour | |
2 hour |
Question 12 |
The rate law for a reaction between the substances A an B is given by Rate = k [A]n [B]m
On doubling the concentration of A and halving the concentration of B, the ratio of the new rate to the earlier rate of reaction will be [AIEEE 2003]
m + n | |
n – m | |
2(n – m) | |
|
Question 13 |
In respect of the equation K = Ae–Ea / RT in chemical kinetics, which one of the following statements is correct? [AIEEE 2003]
k is equilibrium constant | |
A is adsorption factor | |
Ea is energy of activation | |
R is Rydberg's constant |
Question 14 |
Units of rate constant of first and zero order reactions in terms of molarity M unit are respectively [AIEEE 2002]
sec–1, Msec–1 | |
sec–1, M | |
Msec–1, sec–1 | |
M, sec–1 |
Question 15 |
When a bio chemical reaction is carried out in laboratory out side the human body in the absence of enzyme, then the rate of reaction obtained is 10–6 times, than activation energy of
reaction in the presence of enzyme is: [AIPMT 2001]
6/RT | |
P is required | |
Different from, Ea obtained in
laboratory | |
Can't say any things |
it’s gud……….