Chemical Kinetics  MCQs

MCQs of Chemical Kinetics

Showing 81 to 90 out of 228 Questions
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81.
A reaction involving two different reactants
(a) can never be a second order reaction.
(b) can never be a unimolecular reaction.
(c) can never be a bimolecular reaction.
(d) can never be a first order reaction.
Answer:

Option (b)

82.
Which of the following statements regarding the molecularity of a reaction is wrong
(a) it is the number of molecules of the reactants taking part in a single step chemical reaction.
(b) it is calculated from the reaction mechanism.
(c) it may be either a whole number or fractional.
(d) it depends on the rate determining step in the reaction.
Answer:

Option (c)

83.
75% of a first order reaction is completed in 30 minutes. what is the time required for 93.75% if the reaction (in minutes)
(a) 45
(b) 120
(c) 90
(d) 60
Answer:

Option (d)

84.
For a chemical reaction _____ can never be a fraction
(a) Order
(b) Half-life
(c) Molecularity
(d) rate constant
Answer:

Option (c)

85.
The half-life of 2 sample are 0.1 and 0.4 seconds.Their respective concentration are 200 and 50 respectively. What is the order of the reaction
(a) 0
(b) 2
(c) 1
(d) 4
Answer:

Option (b)

86.
Which of the following reactions end in finite time
(a) 0 order
(b) 1st order
(c) 2nd order
(d) 3rd order
Answer:

Option (c)

87.
A large increase in the rate of a reaction for a rise in temperature is due to
(a) The decrease in the number of collisions
(b) The increase in the number of activated molecules
(c) The shortening of the mean free path
(d) The lowering of the activation energy
Answer:

Option (b)

88.
Activation energy of a chemical reaction can be determined by
(a) Changing concentration of reactants
(b) Evaluating rate constant at standard temperature
(c) Evaluating rate constant at two different temperatures
(d) Evaluating velocities of reaction at two different temperatures
Answer:

Option (c)

89.
Half life of a reaction is found to be inversely proportional to the cube of its initial concentration. The order of reaction is
(a) 2
(b) 5
(c) 3
(d) 4
Answer:

Option (d)

90.
The rate of a reaction doubles when its temperature changes from 300 K to 310 K.Activation energy of such a reaction will be: (R = 8.314 JK-1 mol-1 and log 2 = 0.301)
(a) 53.6  kJ mol-1
(b) 48.6  kJ mol-1
(c) 58.5  kJ mol-1
(d) 60.5  kJ mol-1
Answer:

Option (a)

Showing 81 to 90 out of 228 Questions
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