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This mock test of MCQ (Previous Year Questions) - Chemical Kinetics (Level 2) for JEE helps you for every JEE entrance exam.
This contains 11 Multiple Choice Questions for JEE MCQ (Previous Year Questions) - Chemical Kinetics (Level 2) (mcq) to study with solutions a complete question bank.
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QUESTION: 1

Plots showing the variation of the rate constant (k) with temperature (T) are given below. The plot that follows Arrhenius equation is [JEE 2010]

Solution:

Option (A) is correct. K increases exponentially with a rise in T(K=Ae^{−Ea/RT}).

The Arrhenius plot is used to study the effect of temperature on reaction rates. The Arrhenius plot can also be used by extrapolating the line back to the y-intercept to obtain the pre-exponential factor, A.

This factor is significant because A=pZ, where p is a steric factor and Z is the collision frequency. The pre-exponential, or frequency, the factor is related to the number of times molecules will hit in the orientation necessary to cause a reaction.

QUESTION: 2

The rate constant for the reaction

2N_{2}O_{5} → 4NO_{2} + O_{2}

is 3.0 × 10^{–5} sec^{–1}. If the rate is 2.4 × 10^{–5} mol litre^{–1} sec^{–1}, then the concentration of N_{2}O_{5} (in mol litre^{–1})

is [JEE SCR 2000]

Solution:

QUESTION: 3

If I is the intensity of absorbed light and C is the concentration of AB for the photochemical process

AB + hv → AB*, the rate of formation of AB* is directly proportional to [JEE SCR 2001]

Solution:

In photo initiated primary process rate of reaction is directly proportional to intensity of light uses.

Hence B is the correct answer.

QUESTION: 4

Consider the chemical reaction, N_{2}(g) + 3H_{2}(g) → 2NH_{3}(g). The rate of this reaction can be expressed in term of time derivative of concentration of N_{2}(g), H_{2}(g) or NH_{3}(g). Identify the correct relationship amongst the rate expressions. [JEE SCR 2002]

Solution:

QUESTION: 5

In a first order reaction the concentration of reactant decreases from 800 mol/dm^{3} to 50 mol/dm^{3} in 2

× 10^{4} sec. The rate constant of reaction in sec^{–1 }is : [JEE SCR 2003]

Solution:

QUESTION: 6

The reaction, X → Product follows first order kinetics. In 40 minutes the concentration of X changes from 0.1 M to 0.025 M. Then the rate of reaction when concentration of X is 0.01 M [JEE SCR 2004]

Solution:

QUESTION: 7

Which of the following statement is incorrect about order of reaction ? ** [JEE 2005]**

Solution:

QUESTION: 8

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 concentration of G is doubled keeping the concentration of H fixed, the rate is doubled. The overall order of the reaction is [JEE 2006]

Solution:
AG + bH > product

G H

2x 2x > 8r

2x x >2r

Therefore,

r =[H]^2 [G]

Hence,

order =2+1=3

Correct option,

(D)

G H

2x 2x > 8r

2x x >2r

Therefore,

r =[H]^2 [G]

Hence,

order =2+1=3

Correct option,

(D)

QUESTION: 9

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 (k_{1}) and zero order (k_{0}) of the reactions is [JEE 2008]

Solution:

QUESTION: 10

For a first order reaction A → P, the temperature (T) dependent rate constant (k) was found to follow the equation log k = – (2000) 1/T + 6.0. The pre-exponential factor A and the activation energy E_{a}, respectively, are [JEE 2009]

Solution:

*Multiple options can be correct

QUESTION: 11

For the first order reaction

2N_{2}O_{5}(g) → 4NO_{2}(g) + O_{2}(g) [JEE 2011]

Solution:

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