Chemical Kinetics Online MCQ Test for JEE / NEET 1 to 30

Chemical Kinetics Online MCQ Test for JEE / NEET

Quiz

 

1. Which of the following statements for order of reaction is not correct? [IIT JEE 2005]
   1.   Order can be determined experimentally
   2.   Order of a reaction is equal to the sum of the power of concentration terms in differential rate law
   3.   It is not affected with the stoichiometric coefficients of the reactants
   4.   Order cannot be fractional
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]
   1.   2
   2.   -2
   3.   1
   4.   -1
3. A reaction involving two different reactants can never be [AIEEE 2005]
   1.   Unimolecular reaction
   2.   First order reaction
   3.   Second order reaction
   4.   Bimolecular reaction
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]
   1.   Eb < Ef
   2.   Eb > Ef
   3.   Eb = Ef
   4.   there is no definite relation between Eb and Ef
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]
   1.   0.29/k
   2.   0.45/k
   3.   0.1/k
   4.   4.5/k
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.   3.47 × 10^–5 M min^–1
   2.   3.47 × 10^–4 M min^–1
   3.   2.47 × 10^–5 M min^–1
   4.   1.47 × 10^–5 M min^–1
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]
   1.   3.1 min
   2.   38.45 min
   3.   2.1 min
   4.   23.1 min
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]
   1.   10 min
   2.   20 min
   3.   30 min
   4.   45 min
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]
   1.   units of k must be s–1
   2.   value of k is independent of the initial concentration of A and B
   3.   t1/2 is constant
   4.   rate of formation of C is twice the rate of disappearance of A
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]
    1.   1.28 × 10^(–2)
    2.   2.28 × 10^(–2)
    3.   3.28 × 10^(–2)
    4.   4.28 × 10^(–2)
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.   60 min
    2.   120 min
    3.   180 min
    4.   6 min
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]
    1.   1.8 x 2^(n – m)
    2.   2^(n – m)
    3.   m-n
    4.   m+n
13. In respect of the equation K = Ae–Ea / RT in chemical kinetics, which one of the following statements is correct? [AIEEE 2003]
    1.   k is equilibrium constant
    2.   R is Rydberg's constant
    3.   Ea is energy of activation
    4.   A is adsorption factor
14. Units of rate constant of first and zero order reactions in terms of molarity M unit are respectively [AIEEE 2002]
    1.   sec^–1, M
    2.   M, sec^–1
    3.   sec^–1, Msec^–1
    4.   m.C
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]
    1.   Different from, Ea obtained in laboratory
    2.   Can't say any things
    3.   P is required
    4.   6/RT
16. Which one of the following is a second order reaction? [Karnataka CET 2007]
    1.   H2 + Br2 → 2BHr
    2.   NH4NO3 → N2 + 3H2O
    3.   H2 + Cl2 (Sun light)------>2HCl
    4.   CH3COOCH3 + NaOH → CH3COONa + H2O
17. Consider a reaction, aG + bH → Products.
    
    When concentration of both the reactants G and H is doubled, the rate increases by eight times. However, when the concentration of G is doubled keeping the concentration of H fixed, the rate is doubled. The overall order of the reaction is: [IIT JEE 2007]
    1.   0
    2.   1
    3.   2
    4.   3
18. If 60% of a first order reaction was completed in 60 minutes, 50% of the same reaction would be completed in approximately [CBSE PMT 2007]
    1.   45 minutes
    2.   55 minutes
    3.   65 minutes
    4.   25 minutes
19. Consider the reaction,
    
    2A + B → Products
    
    When concentration of B alone was doubled, the half-life did not change. When the concentration of A alone was doubled, the rate increased by two times. The unit of rate constant for this reaction is: [AIEEE 2007]
    1.   mol L–1 s–1
    2.   L mol–1 s–1
    3.   s–1
    4.   unit less
20. The energies of activation for forward and reverse reactions for A2 + B2 2AB are 180 kJ mol–1 and 200 kJ mol–1 respectively. The presence of a catalyst lowers the activation energy of both (forward and reverse) reactions by 100 kJ mol–1. The enthalpy change of the reaction (A2 + B2 → 2AB) in the presence of catalyst will be (in kJ mol–1): [AIEEE 2007]
    
    2A + B → Products
    
    When concentration of B alone was doubled, the half-life did not change. When the concentration of A alone was doubled, the rate increased by two times. The unit of rate constant for this reaction is: [AIEEE 2007]
    1.   120
    2.   20
    3.   280
    4.   300
21. For a reaction A + B → C + D if the concentration of A is doubled without altering the concentration of B, the rate gets doubled. If the concentration of B is increased by nine times without altering the concentration of A, the rate gets tripled. The order of the reaction is [Karnataka CET 2006]
    1.   2
    2.   3/2
    3.   1
    4.   3
22. A reaction was found to be second order with respect to concentration of carbon monoxide. If the concentration of carbon monoxide is doubled, with everything else kept the same, the rate of reaction will [AIEEE 2006]
    1.   3x
    2.   increase by a factor of 4
    3.   2x
    4.   remain unchanged
23. Rate of a reaction can be expressed by Arrhenius equation as:
    
    k = Ae–E/RT
    
    In this equation, E represents [AIEEE 2006]
    1.   the total energy of the reacting molecules at a temperature, T.
    2.   the fraction of molecules with energy greater than the activation energy.
    3.   the energy above which all the colliding molecules will react.
    4.   the energy below which colliding molecules will not react
24. For the reaction A + B → C, it is found that doubling the concentration of A increases the rate by 4 times, and doubling the concentration of B doubles the reaction rate. What is the overall order of the reaction? [Karnataka CET 2005]
    1.   3
    2.   3/2
    3.   2
    4.   4
25. Which of these does not influence the rate of reaction? [Karnataka CET 2005]
    1.   Molecularity of the reaction
    2.   Nature of the reactants
    3.   Concentration of the reactants
    4.   Temperature of the reaction
26. The time for half life period of a certain reaction A → Products is 1 h. When the initial concentration of the reactant 'A' is 2.0 mol L–1, how much time does it take for its concentration to come from 0.50 to 0.25 mol L–1, if it is a zero order reaction? [AIEEE 2010]
    1.   5 hr
    2.   2.87 hr
    3.   0.25 hr
    4.   5 hr
27. The time taken for 10% completion of a first order reaction is 20 min. Then, for 19% completion, the reaction will take [WB JEE 2009]
    1.   60 min
    2.   20 min
    3.   30 min
    4.   40 min
28. The rate equation for a reaction: A → B is r = K [A]°. If the initial concentration of the reactant is a mol dm–3, the half life period of the reaction is [Karnataka CET 2009]
    1.   a/2k
    2.   a/k
    3.   k/a
    4.   45
29. For the reaction A + B → products, it is observed that
    
    (i) On doubling the concentration of A only, the rate of reaction is also doubled.
    
    (ii) On doubling the initial concentration of both A and B, there is change by a factor of 8 in the rate of reaction.
    
    The rate of reaction is given by [CBSE AIPMT 2009]
    1.   rate = k [A]3 [B]2
    2.   rate = k [A] [B]2
    3.   rate = k [A]4 [B]2
    4.   rate = k [A]2 [B]
30. Under the same reaction conditions, initial concentration of 1.386 mol dm–3 of a substance becomes half in 40 seconds and 20 seconds through first order and zero order kinetics respectively. Ratio of the rate constants for first order (k1) and zero order (k0) of the reaction is [IIT JEE 2008] ( unit in mol^(–1) dm^3
    1.   0.5
    2.   1.0
    3.   1.5
    4.   2.0