Reaction Order Chemical Kinetics | MCQs for CSIR NET & GATE | Download PDF

Vijay Ishwar
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 Order of Reaction
MCQs for CSIR NET & GATE

Chemical Kinetics
Topic wise Assignment-2

QUIZ        PDF

Q1. If the unit of the rate constant is L3 mol-3 s-1, the order of the reaction is

[NET June 2018]

            (a) 1

            (b) 2

            (c) 3

            (d) 4

Q2. Reaction between A and B is carried out for different initial concentrations and the corresponding half life times are measured. The data is listed in the table

[NET Dec 2017]

The rate can be represented as

            (a) k [A] [B]

            (b) k [A]2

            (c) k [A]2 [B]

            (d) k [A] [B]2

Q3. The rate constant of a reaction is 1.25 x 10-4 mol L-1 s-1. If the initial concentrations of the reactant is 0.250 mol L-1, the total time (in seconds) required for complete conversion is _______.

[GATE 2017]

Q4. In kinetic study of a chemical reaction, slopes are drawn at different times in the plot of concentration of reactants versus time. The magnitude of slopes with increase of time

[NET June 2017]

            (a) remains unchanged

            (b) increases

            (c) decreases

            (d) increases and decreases periodically

Q5. The graph below plots the progress of a dimerization reaction involving species A. It depicts a straight line with slope k (the rate constant). What is the value of the intercept c in the graph?

[TIFR 2017]

            (a) [A (0)]

            (b) [A (0)]2

            (c) [A (0)]-1

            (d) k x [A (0)]2

Q6. The fraction of groups condensed at time t in any stepwise condensation polymerization (overall second order reaction) is

[NET Dec 2014]

    

Q7. Half life t1/2 for a third order reaction 3C products, where Co is the initial concentration of C, will be

    

Q8. Experimentally determined rate law for the chemical reaction
2 NO2F
2 NO2 + F2 is R = k [NO2F]
The rate determining step consistent with the rate law is

[NET June 2016]

            (a) 2 NO2F 2 NO2 + F2

            (b) NO2F + F NO2 + F

            (c) NO2F NO2 + F

            (d) NO2 + F NO2F

Q9. The concentration of a reactant R varies with time for two different reactions as shown in the following plots:

[NET Dec 2015]

The order of these two reactions I and II respectively are

            (a) zero and one

            (b) one and zero

            (c) zero and two

            (d) two and zero

Q10. Statement: Catalytic decomposition of ammonia on platinum takes place at 1000oC

Reason: Ammonia is more strongly adsorbed than hydrogen on platinum

Assertion: The rate law for the decomposition of ammonia on platinum is given as,

[GATE 2001]

            (a) both reason and assertion are correct

            (b) both reason and assertion are wrong

            (c) reason is correct but assertion is wrong

            (d) reason is wrong but assertion is correct

Q11. Decomposition of ammonia on tungsten at 850oC has a rate constant value of 0.10 Torr s-1. If the initial pressure of ammonia is 100 Torr, the pressure of ammonia (in torr) at t = 200s is

[GATE 2004]

            (a) 10

            (b) 20

            (c) 50

            (d) 80

Q12. Sucrose is converted to a mixture of glucose and fructose in a pseudo first order process under alkaline conditions. The reaction has a half-life of 28.4 min. The time required for the reduction of a 8.0 mM sample of sucrose to 1.0 mM is

[GATE 2007]

            (a) 56.8 min

            (b) 170.4 min

            (c) 85.2 min

            (d) 227.2 min

Q13. The half-life time for a reaction at initial concentration of 0.1 mol-1 and 0.4 mol-1 are 200 s and 50 s respectively. The order of the reaction is

[GATE 2000]

            (a) 0

            (b) 1

            (c) 2

            (d) 3

Q14. For a first order reaction A products, the plot of ln [A]t/[A]o vs time, where [A]o and [A]t refer to concentration at time t = 0 and t respectively is

[NET June 2014]

            (a) a straight line with a positive slope passing through origin

            (b) a straight line with a negative slope passing through origin

            (c) an exponential curve asymptotic to the time axis

            (d) a curve asymptotic to the ln [A]t/[A]o axis

Q15. In the following reaction mechanism

NO2 (g) + F2 (g) NO2F (g) + F (g)
F (g) + NO2 (g)
NO2F (g)

The first step, having a rate constant K1, is very slow while the second step having a rate constant K2, is very first. The rate law for this mechanism will therefore be

            (a) Rate = k1 [NO2] [F2]

            (b) Rate = k1k2 [NO2]2 [F2]2

            (c) Rate = k2 [NO2] [F]

            (d) Rate = k2 [NO2F] [F]

Ans Key:

Q1.d Q2.c Q3.2000 Q4.c Q5.c Q6.c Q7.a Q8.c Q9.c Q10.NA Q11.d Q12.c Q13.c Q14.b Q15.a 


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