Chemical Kinetics — DPP 3

20 NEET questions from Chemical Kinetics, with answers and explanations. Attempt it as a timed test to get scoring, accuracy breakdown and mistake tracking.

Attempt this test free 20 questions · 30 minutes · +80 marks
1
The rate law for the reaction, x A + y B $\rightarrow$ m P + n Q is rate = k[A]$^{c}$[B]$^{d}$. What is the total order of the reaction?
  1. A x + y
  2. B m + n
  3. C c + d
  4. D y + m
Show answer

Correct answer: C

2
The unit of rate constant obeying the rate expression $\mathrm { r } = \mathrm { k } [ \mathrm { A } ] ^ { 1 } [ \mathrm {~B} ] ^ { 2 / 3 }$ is:
  1. A mole$^{-2/3}$ litre $^ { 2 / 3 }$ time ${ } ^ { - 1 }$.
  2. B mole ${ } ^ { 2 / 3 }$ litre $^ { - 2 / 3 }$ time $^ { - 1 }$.
  3. C mole ${ } ^ { - 2 / 3 }$ litre $^ { - 2 / 3 }$ time $^ { - 1 }$.
  4. D mole ${ } ^ { 2 / 3 }$ litre $^ { - 2 / 3 }$ time ${ } ^ { - 1 }$.
Show answer

Correct answer: A

3
On increasing the pressure three fold, the rate of reaction of $2 \mathrm { H } _ { 2 } \mathrm {S} ( \mathrm {g} ) + \mathrm { O } _ { 2 } ( \mathrm {g} ) \rightarrow$ products, would increase:
  1. A 3 times
  2. B 9 times
  3. C 12 times
  4. D 27 times
Show answer

Correct answer: D

4
In the reaction; $\mathrm { A } + 2 \mathrm {B} \rightarrow 3 \mathrm { C } + \mathrm { D }$, which of the following expression does not describe changes in the concentration of various species as a function of time?
  1. A $\{ \mathrm { d } [ \mathrm { C } ] / \mathrm { dt } \} = - \{ 3 \mathrm {~d} [ \mathrm {~A} ] / \mathrm { dt } \}$
  2. B $\{ 3 \mathrm {~d} [ \mathrm { D } ] / \mathrm { dt } \} = \{ \mathrm { d } [ \mathrm { C } ] / \mathrm { dt } \}$
  3. C $\{ 3 \mathrm {~d} [ \mathrm {~B} ] / \mathrm { dt } \} = - \{ 2 \mathrm {~d} [ \mathrm { C } ] / \mathrm { dt } \}$
  4. D $\{ 2 \mathrm {~d} [ \mathrm {~B} ] / \mathrm { dt } \} = \{ \mathrm { d } [ \mathrm { A } ] / \mathrm { dt } \}$
Show answer & explanation

Correct answer: D

A + 2B → 3C + D
$-\frac{\mathrm{d}[\mathrm{A}]}{\mathrm{dt}}=-\frac{1}{2} \frac{\mathrm{~d}[\mathrm{~B}]}{\mathrm{dt}}=\frac{1}{3} \frac{\mathrm{~d}[\mathrm{C}]}{\mathrm{dt}}=\frac{\mathrm{d}[\mathrm{D}]}{\mathrm{dt}}$
Therefore, option (4) is correct answer.
5
A reaction involving two different reactants can never be:
  1. A unimolecular reaction.
  2. B first order reaction.
  3. C second order reaction.
  4. D bimolecular reaction.
Show answer

Correct answer: A

6
Find the order of the reaction if the rate constant (k) of reaction is $300 \mathrm {~L} ^ { 2 } \mathrm {~mol} ^ { - 2 } \mathrm {~s} ^ { - 1 }$.
  1. A First order
  2. B Second order
  3. C Third order
  4. D Fourth order
Show answer

Correct answer: C

7
The rate of reaction between A and B increases by a factor of 100 when the concentration of A is increased 10 folds. The order of reaction with respect to A is:
  1. A 10
  2. B 1
  3. C 4
  4. D 2
Show answer

Correct answer: D

8
When molecules of type A reacts with molecules of type B in one-step process to give $\mathrm { AB } _ { 2 }$, the rate law is:
  1. A rate $= \mathrm { k } [ \mathrm { A } ] ^ { 1 } [ \mathrm {~B} ] ^ { 2 }$
  2. B rate $= \mathrm { k } [ \mathrm { A } ] ^ { 2 } [ \mathrm {~B} ] ^ { 1 }$
  3. C rate $= \mathrm { k } [ 2 \mathrm {~A} ] [ \mathrm { B } ]$
  4. D rate $= \mathrm { k } [ \mathrm { A } ] [ \mathrm { B } ]$
Show answer

Correct answer: A

9
Units of specific reaction rate for second order reaction:
  1. A $\mathrm { s } ^ { - 1 }$
  2. B $\mathrm { mol } \mathrm {~L } ^ { - 1 } \mathrm {~s} ^ { - 1 }$
  3. C $\mathrm { L } \mathrm {~mol } ^ { - 2 } \mathrm {~s} ^ { - 1 }$
  4. D $\mathrm { L } \mathrm {~mol } ^ { - 1 } \mathrm {~s} ^ { - 1 }$
Show answer

Correct answer: D

10
Which one of the following statements for the order of a reaction is incorrect?
  1. A Order of reaction is always a whole number.
  2. B Order can be determined only experimentally.
  3. C Order is not influenced by stoichiometric coefficient of the reactants.
  4. D Order of reaction is sum of power to the concentration terms of reactant to express the rate of reaction while writing the rate law.
Show answer

Correct answer: A

11
The term $- \frac { \mathrm { d } [ \mathrm { C } ] } { \mathrm { dt } }$ refers to:
  1. A rate of reaction
  2. B decrease in concentration of reactants with time
  3. C increase in concentration of reactants with time
  4. D decrease in the concentration of products with time
Show answer

Correct answer: B

12
The rate constant is numerically the same for three reactions of first, second and third order respectively. Which one is true for rate of three reactions, if concentration of reactant is greater than 1 M ?
  1. A $r _ { 1 } = r _ { 2 } = r _ { 3 }$
  2. B $r _ { 1 } > r _ { 2 } > r _ { 3 }$
  3. C $r _ { 1 } < r _ { 2 } < r _ { 3 }$
  4. D None of these.
Show answer

Correct answer: C

13
Which of the following cannot be determined experimentally?
  1. A Order
  2. B Rate
  3. C Rate constant
  4. D Molecularity
Show answer

Correct answer: D

14
The value of the rate constant of a reaction depends on:
  1. A time
  2. B volume of container
  3. C temperature
  4. D half life value
Show answer

Correct answer: C

15
The rate constant of the reaction, $\mathrm { A } \longrightarrow \mathrm { B }$ is $0.6 \times 10 ^ { - 3 }$ mole per litre per second. If the concentration of A is 5 M , then concentration of B after 20 minutes is:
  1. A 0.36 M
  2. B 0.72 M
  3. C 1.08 M
  4. D 3.60 M
Show answer

Correct answer: B

16
The order of a reaction can be predicted with the help of:
  1. A molecularity of the reaction
  2. B activation energy of the reaction
  3. C rate equation of the reaction
  4. D reaction rate
Show answer

Correct answer: C

17
For the reaction $\mathrm { A } \rightarrow \mathrm { B }$, the rate law expression is; Rate $= \mathrm { k } [ \mathrm { A } ]$. Which of the following statements is incorrect?
  1. A The reaction is said to follow first order kinetics.
  2. B The half life of the reaction will depend on the initial concentration of the reactant.
  3. C Rate constant is constant for the reaction at a constant temperature.
  4. D The rate law provides a simple way of predicting the concentration of reactants and products at any time after the start of the reaction.
Show answer

Correct answer: B

18
If the half-life of the first order reaction is 50 s , then what is the value of its rate constant?
  1. A $1.38 \times 10 ^ { - 2 } \mathrm {~s} ^ { - 1 }$
  2. B $25 \mathrm {~s} ^ { - 1 }$
  3. C $34.66 \mathrm {~s} ^ { - 1 }$
  4. D $1.38 \times 10 ^ { - 4 } \mathrm {~s} ^ { - 1 }$
Show answer

Correct answer: A

19
Consider the reaction: $2 \mathrm {~N} _ { 2 } \mathrm { O } _ { 5 } \rightarrow 4 \mathrm { NO } _ { 2 } + \mathrm { O } _ { 2 }$.
In the reaction $\mathrm { NO } _ { 2 }$ is being formed at the rate of 0.0125 $\mathrm { mol } \mathrm {~L } ^ { - 1 } \mathrm {~s} ^ { - 1 }$. What is the rate of reaction at this time?
  1. A $0.0018 \mathrm {~mol} \mathrm {~L} ^ { - 1 } \mathrm {~s} ^ { - 1 }$
  2. B $0.0031 \mathrm {~mol} \mathrm {~L} ^ { - 1 } \mathrm {~s} ^ { - 1 }$
  3. C $0.0041 \mathrm {~mol} \mathrm {~L} ^ { - 1 } \mathrm {~s} ^ { - 1 }$
  4. D $0.050 \mathrm {~mol} \mathrm {~L} ^ { - 1 } \mathrm {~s} ^ { - 1 }$
Show answer

Correct answer: B

20
Radioactive decay follows which order kinetics?
  1. A Zero order
  2. B First order
  3. C Second order
  4. D Third order
Show answer

Correct answer: B

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