Find here the NCERT chapter-wise Multiple Choice Questions from Class 12 Chemistry book Chapter 4 Chemical Kinetics with Answers Pdf free download. This may assist you to understand and check your knowledge about the chapters. Students also can take a free test of the Multiple Choice Questions of Chemical Kinetics. Each question has four options followed by the right answer. These MCQ Questions are selected supported by the newest exam pattern as announced by CBSE.
MCQ Questions for Class 12 Chemistry With Answers
Q1. The rate of a reaction is primarily determined by the slowest step. This step is called
(i) rate determining step
(ii) activation step
(iii) reaction rate step
(iv) none of these.
(i) rate determining step
Q2. A catalyst increases the speed of a chemical reaction by
(i) increasing activation energy
(ii) decreasing activation energy
(iii) increasing reactant energy
(iv) decreasing threshold energy
(ii) decreasing activation energy
Q3. If the rate of a reaction is expressed by, rate = A [A]² [B], the order of reaction will be
(i) 2
(ii) 3
(iii) 1
(iv) 0
(ii) 3
Q4. Which of the following statements about the catalyst is true?
(i) A catalyst accelerates the rate of reaction by bringing down the activation energy.
(ii) A catalyst does not participate in reaction mechanism.
(iii) A catalyst makes the reaction feasible by making ∆G more negative.
(iv) A catalyst makes equilibrium constant more favourable for forward reaction.
(i) A catalyst accelerates the rate of reaction by bringing down the activation energy.
Q5. The role of a catalyst is to change
(i) gibbs energy of reaction.
(ii) enthalpy of reaction.
(iii) activation energy of reaction.
(iv) equilibrium constant.
(iii) activation energy of reaction.
Q6. For a chemical reaction A → B, it is found that the rate of the reaction quardruples when the concentration of A is doubled. The rate expression for the reaction is, rate = k [A]n where the value of n is
(i) 1
(ii) 2
(iii) 0
(iv) 3
(ii) 2
Q7. A reaction is found to be of second order with respect to concentration of carbon monoxide. If concentration of carbon monoxide is doubled, the rate of reaction will
(i) triple
(ii) increase by a factor of 4
(iii) double
(iv) remain unchanged
(ii) increase by a factor of 4
Q8. A reaction in which reactants (R) are converted into products (P) follows second order kinetics. If concentration of R is increased by four times, what will be the increase in the rate of formation of P?
(i) 9 times
(ii) 4 times
(iii) 16 times
(iv) 8 times
(iii) 16 times
Q9. For a chemical reaction A→B, it is found that the rate of reaction doubles when the concentration of A is increased four times. The order of reaction is
(i) Two
(ii) One
(iii) Half
(iv) Zero
(iii) Half
Q10. Which of the following statements is not correct about order of a reaction.
(i) The order of a reaction can be a fractional number.
(ii) Order of a reaction is experimentally determined quantity.
(iii) The order of a reaction is always equal to the sum of the stoichiometriccoefficients of reactants in the balanced chemical equation for a reaction.
(iv) The order of a reaction is the sum of the powers of molar concentrationof the reactants in the rate law expression
(iii)The order of a reaction is always equal to the sum of the stoichiometriccoefficients of reactants in the balanced chemical equation for a reaction.
Q11. The half-life period of any first order reaction
(i) is half the specific rate constant
(ii) is always the same irrespective of the reaction
(iii) is independent of initial concentration
(iv) in directly proportional to initial concentration of reactants.
(iii) is independent of initial concentration
Q12. A catalyst increases the rate of a reaction by
(i) increasing threshold energy
(ii) increasing activation energy
(iii) activating the reactants
(iv) lowering activation energy
(iv) lowering activation energy
Q13. For a reaction x + y → z, rate ∝ |X|. What is (i) moleculariiy and (ii) order of reaction?
(a) (i)2, (ii) 1
(b) (i)2,(ii) 2
(c) (i) 1, (ii) 1
(d) (i) 1, (ii) 2
(a) (i)2, (ii) 1
Q14. Which of the following statement is not correct for the catalyst?
(i)It catalyses the forward and backward reaction to the same extent.
(ii)It alters ∆G of the reaction.
(iii)It is a substance that does not change the equilibrium constant of areaction.
(iv)It provides an alternate mechanism by reducing activation energybetween reactants and products.
(ii)It alters ∆G of the reaction.
Q15. The ratio t7/8 : t1/2 for the first order is
(i) 3
(ii) 5
(iii) 2
(iv) 7
(i) 3
Q16. The overall order of a reaction, which has the rate expression: Rate = AC[A]1/2[B]3/2 is:
(i) First order
(ii) Second order
(iii) Third order
(iv) Zero order
(ii) Second order
Q17. The unit of rate and rate constant are same fora
(i) zero order reaction
(ii) first order reaction
(iii) second order reaction
(iv) third order reaction
(i) zero order reaction
Q18. For the first order reaction, the half-life is independent of
(i) catalyst
(ii) temperature
(iii) both catalyst and temperature
(iv) initial concentration of reactants.
(iv) initial concentration of reactants.
Q19. If rate constant for a reaction is mole litre-1 second-1, then order of reaction is:
(i) Zero order
(ii) First order
(iii) Second order
(iv) None of these
(i) Zero order
Q20. Fora unimolecular reaction
(i) the order and molecuiarity of the slowest step are equal to one
(ii) molecuiarity of the reaction can be zero, one or two
(iii) molecuiarity of the reaction can be determined only experimentally
(iv) more than one reacting species are involved in one step
(i) the order and molecuiarity of the slowest step are equal to one
Q21. If half life period of a first order reaction is 100 seconds. Then rate constant will be:
(i) 6.93 × 10-3 second-1
(ii) 6.93 × 10-2 second-1
(iii) 0.693 second-1
(iv) 6.93 second-1
(i)
Q22. Arrhenius equation is represented by:
(i) k = AeEa/RT
(ii) k = Ae-Ea/RT
(iii) t1/2 = 0.693/k
(iv) None of these
(ii)
I Think the given NCERT MCQ Questions for class 12 Chemistry book Chapter 4 Chemical Kinetics with Answers Pdf free download will assist you. If you’ve got any queries regarding CBSE Class 12 Chemistry Chemical Kinetics MCQs Multiple Choice Questions with Answers, drop a comment below and that we will come back to you soon.
MCQ Questions for Class 12 Chemistry with Answers
- Lesson 1. The Solid State Class 12 MCQ Questions
- Lesson 2. Solutions Class 12 MCQs
- Lesson 3. Electrochemistry Class 12 MCQs
- Lesson 4. Chemical Kinetics Class 12 MCQs
- Lesson 5. Surface Chemistry Class 12 MCQs
- Lesson 6. General Principles and Processes of Isolation of Elements Class 12 MCQ Questions
- Lesson 7. The p-Block Elements Class 12 MCQ Questions
- Lesson 8. The d-and f-Block Elements Class 12 MCQ Questions
- Lesson 9. Coordination Compounds Class 12 MCQ Questions
- Lesson 10. Haloalkanes and Haloarenes Class 12 MCQ Questions
- Lesson 11. Alcohols, Phenols and Ethers Class 12 MCQ
- Lesson 12. Aldehydes, Ketones and Carboxylic Acids Class 12 MCQ
- Lesson 13. Amines Class 12 MCQ
- Lesson 14. Biomolecules Class 12 MCQ
- Lesson 15. Polymers Class 12 MCQ
- Lesson 16. Chemistry in Everyday Life Class 12 MCQ