Chemical Kinetics Questions And Answers Pdf
Multiple Choice Questions
These Chemical Kinetics Questions and Answers PDF are prepared by our Livelearns team for NEET and JEE Mains. These Chemical Kinetics NEET Questions are based on the chapter on Chemistry Chemical Kinetics Preparation of these questions has been taken from various books including NCERT, Previous year’s question papers, and model papers. So these Chemical Kinetics JEE Questions cover all the class 12 subject chemistry topics of Chemical Kinetics, These MCQs are very helpful in your preparation for the National Eligibility cum Entrance Test-UG (NEET) and JEE mains. We have provided these questions in PDF format which you can Download by clicking the link as provide below. These Chemical Kinetics JEE Mains Questions PDF are absolutely FREE for you from Livelearns Team.
CHEMICAL KINETICS Questions and Answers PDF
Chemical Kinetics All Topics Are Cover Click One By One To Read Everythings
1. 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.
Ans:- (iii) activation energy of reaction.
2. In the presence of a catalyst, the heat evolved or absorbed during the reaction ___________.
(i) increases.
(ii) decreases.
(iii) remains unchanged.
(iv) may increase or decrease.
Ans. (iii) remains unchanged.
3. Activation energy of a chemical reaction can be determined by _____________.
(i) determining the rate constant at standard temperature.
(ii) determining the rate constants at two temperatures.
(iii) determining probability of collision.
(iv) using a catalyst.
Ans. (ii) determining the rate constants at two temperatures.
4. Consider Fig. 4.1 and mark the correct option.
(i) Activation energy of forward reaction is
E1 + E2 and product is less stable than reactant.
(ii) Activation energy of forward reaction is 1+E2 and the product is more stable than reactant.
(iii) Activation energy of both forward and backward reaction is E1+E2 and reactant is more stable than product.
(iv) Activation energy of backward reaction is E1 and product is more stable than reactant.
ANS. (i) Activation energy of forward reaction is E1 + E2 and the product is less stable than reactant.
5. Consider a first order gas phase decomposition reaction given below : A(g) → B(g) + C(g)
The initial pressure of the system before decomposition of A was pi. After the lapse of time ‘t’, total pressure of the system increased by x units and became ‘pt’ The rate constant k for the reaction is given as _________.
(i)2.303 log i =− kt p x i p
(ii)2.303 log2i
kt p p =− i t p
(iii)2.303 log2i kt p p =+ i t p
(iv)2.303 log i =+ kt p x i
ANS. (II)
Also read:-
- Very Important Questions for Class 12 Chemistry
- Class 12 Chemistry Important Questions
- Chemical Kinetics Questions and Answers
6. According to Arrhenius equation rate constant k is equal to A e–E /RT a . Which of the following options represents the graph of ln k vs 1T ?
(i) (ii)
(iii) (iv)
Exemplar Problems, Chemistry 48
ANS. (I)
7. Consider the Arrhenius equation given below and mark the correct option. –E /RT k = A e
(i) Rate constant increases exponentially with increasing activation energy and decreasing temperature.
(ii) Rate constant decreases exponentially with increasing activation energy and decreasing temperature.
(iii) Rate constant increases exponentially with decreasing activation energy and decreasing temperature.
(iv) Rate constant increases exponentially with decreasing activation energy and increasing temperature.
ANS. (iv) Rate constant increases exponentially with decreasing activation energy and increasing temperature.
8. A graph of volume of hydrogen released vs time for the reaction between zinc and dil.HCl is given in Fig. 4.2. On the basis of this mark the correct option.
V V−
(i) Average rate upto 40s is 3 2 40 V V−
(ii) Average rate upto 40 seconds is 3 2 40 30 − V
(iii) Average rate upto 40 seconds is 3 40 V V−
(iv) Average rate upto 40 seconds is 3 1 40 20 −
ANS. (III)
9. 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 stoichiometric coefficients of reactants in the balanced chemical equation for a reaction.
(iv) The order of a reaction is the sum of the powers of molar concentration of the reactants in the rate law expression.
ANS. (iii) The order of a reaction is always equal to the sum of the stoichiometric coefficients of reactants in the balanced chemical equation for a reaction.
10. Consider the graph given in Fig. 4.2. Which of the following options does not show an instantaneous rate of reaction at 40th second?
(i) 5 2 50 30 − V V−
(ii) 4 2 50 30 − V V−
(iii) 3 2 40 30 − V V−
(iv) 3 1 40 20 −
ANS. (II)