JEE Questions for Chemistry Chemical Kinetics Quiz 1 - MCQExams.com

Rate of reaction depends upon
  • temperature
  • catalyst
  • concentration
  • All of these
The unit of second order reaction rate constant is
  • L-1 mol s-1
  • L2 mol-2 s-1
  • L mol-1 s-1
  • s-1
The half-life of a reaction is halved as the initial concentration of the reactant is doubled. The order of the reaction is
  • 0.5
  • 1
  • 2
  • 0
For a first order reaction the ratio of times to complete 99.9% and half of the reaction is
  • 8
  • 9
  • 10
  • 12
A first order reaction is 60% complete in 20 min. How long will the reaction take to be 84% complete?
  • 68 min
  • 40 min
  • 76 min
  • 54 min
A reaction proceeds by first order, 75% of this reaction was completed in 32 min. The time required for 50% completion is
  • 8 min
  • 16 min
  • 20 min
  • 24 min
For a reaction, the rate constant is 2.34 s-1. The half-life period for the reaction is
  • 0.30 s
  • 0.60 s
  • 3.3 s
  • data is insufficient

Chemistry-Chemical Kinetics-1497.png
  • first
  • second
  • zero
  • third
Inversion of cane-sugar in dilute acid is a
  • bimolecular reaction
  • pseudo-unimolecular reaction
  • unimolecular reaction
  • trimolecular reaction
For which order half-life period is independent of initial concentration ?
  • Zero
  • First
  • Second
  • Third
For a first order reaction with rate constant 'k' and initial concentration 'a' , the half-life period is given by

  • Chemistry-Chemical Kinetics-1499.png
  • 2)
    Chemistry-Chemical Kinetics-1500.png

  • Chemistry-Chemical Kinetics-1501.png
  • None of these
The reaction 2A + B + C → D + E is found to be first order in A, second in B and zero order in C. What is the effect on the rate of increasing concentration of A ,B and C two times ?
  • 24 times
  • 36 times
  • None of these
  • 72 times
  • 8 times
In a chemical reaction, two reactants take part. The rate of reaction is directly proportional to the concentration of one of them and inversely proportional to the concentration of the other. The order of reaction is
  • 0
  • 1
  • 2
  • 4
A reaction involving two different reactants can never be
  • bimolecular reaction
  • second order reaction
  • first order reaction
  • unimolecular reaction
In the first order reaction, the concentration of the reactants is reduced to 25% in one hour. The half-life period of the reaction is
  • 2 h
  • 4 h
  • 1/2 h
  • 1/4 h
For a reaction, X (g) → Y (g) + Z(g) the half-life period is 10 min. In what period of time would the concentration of X be reduced to 10% of original concentration ?
  • 20 min
  • 33 min
  • 15 min
  • 25 min
A first order reaction is 10% complete in 20 min. The time taken for 19% completion is
  • 30 min
  • 40 min
  • 50 min
  • 38 min
  • 45 min
If the rate of reaction A → B doubles on increasing the concentration of A by 4 times, the order of the reaction is
  • 2
  • 1
  • 1/2
  • 4
By increase in temperature by 10 K, the rate of reaction becomes double. How many times the rate of reaction will be if the temperature is increased from 303K to 353 K?
  • 4
  • 8
  • 16
  • 32
The rate of reaction increases with temperature due to
  • decrease in activation energy
  • increase in activation energy
  • increase in collision frequency
  • increase in concentration
Activation energy of a reaction
  • is independent of temperature
  • increases with temperature
  • gets doubled for every 10 degree rise in temperature
  • decreases with temperature
Chemical reactions with very high Ea values are generally
  • very fast
  • very slow
  • moderately fast
  • spontaneous
With increase in temperature, rate of reaction
  • increases
  • decreases
  • remains same
  • may increase or decrease
Which increases on increase of temperature ?
  • Energy of activation (Ea)
  • Collision frequency (Z)
  • Rate constant (k)
  • Both (and (3)
The minimum energy required for the reacting molecules to undergo reaction is
  • potential energy
  • kinetic energy
  • thermal energy
  • activation energy
Unit of frequency factor (A) is
  • mol/L
  • mol/L × s
  • depends upon order of reaction
  • it does not have any unit
Temperature coefficient of a reaction is 2. When temperature is increased from 30°C to 100°C, rate of the reaction increases by
  • 128 times
  • 100 times
  • 500 times
  • 250 times
The reason for almost doubling the rate of reaction on increasing the temperature of the reaction system by 10°C is
  • the value of threshold energy increases
  • collision frequency increases
  • the fraction of the molecule having energy equal to threshold energy increases
  • activation energy decreases
For the elementary reaction M → N, the rate of disappearance of M increases by factor of 8 upon doubling the concentration of M. The order of the reaction with respect to M is
  • 4
  • 3
  • 2
  • 1
Which factor has no influence on the rate of reaction?
  • Molecularity
  • Temperature
  • concentration of reactant
  • Nature of reactant
0:0:1


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