The Effect of Temperature on the Rate of Reactions NEET Questions

Physical Chemistry - Chemical Kinetics

The Effect of Temperature on the Rate of Reactions MCQ Questions


13.
At high temperatures, the increase in rate of reaction is primarily due to
A.
Increase in activation energy
B.
Decrease in collision frequency
C.
Increase in number of effective collisions
D.
Decrease in frequency factor
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ANSWER :
C. Increase in number of effective collisions
14.
When temperature increases, the value of exponential term e^(-Ea/RT)
A.
Decreases
B.
Increases
C.
Becomes zero
D.
Remains unchanged
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ANSWER :
B. Increases
15.
The factor e^(-Ea/RT) in Arrhenius equation represents
A.
Fraction of molecules with enough energy
B.
Total number of collisions
C.
Frequency of collisions
D.
Entropy change
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ANSWER :
A. Fraction of molecules with enough energy
16.
Which of the following affects the rate constant of a reaction?
A.
Temperature only
B.
Concentration only
C.
Catalyst only
D.
Both temperature and catalyst
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ANSWER :
D. Both temperature and catalyst
17.
At higher temperatures, what happens to the kinetic energy of reacting molecules?
A.
Decreases
B.
Remains same
C.
Increases
D.
Becomes zero
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ANSWER :
C. Increases
18.
A rise in temperature by 10°C causes the rate of a reaction to become 4 times. What is the temperature coefficient?
A.
1
B.
2
C.
4
D.
10
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ANSWER :
C. 4