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


1.
The temperature coefficient of a reaction is defined as the ratio of rate constants at two temperatures differing by:
A.
1 °C
B.
25 °C
C.
100 °C
D.
10 °C (or 10 K)
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ANSWER :
D. 10 °C (or 10 K)
2.
For most chemical reactions, a 10 °C rise in temperature increases the rate of reaction approximately by a factor of:
A.
100 times
B.
10 times
C.
2 to 3 times
D.
1.1 times
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ANSWER :
C. 2 to 3 times
3.
The rate of a chemical reaction generally increases on increasing the temperature mainly because:
A.
the threshold energy of the reactants decreases
B.
the fraction of molecules having energy ≥ activation energy increases
C.
the collision frequency becomes the only deciding factor
D.
activation energy of the reaction decreases
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ANSWER :
B. the fraction of molecules having energy ≥ activation energy increases
4.
The Arrhenius equation expressing the dependence of rate constant k on temperature is:
A.
k = A e^(–RT/Ea)
B.
k = A e^(–Ea/RT)
C.
k = A e^(Ea·RT)
D.
k = A e^(+Ea/RT)
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ANSWER :
B. k = A e^(–Ea/RT)
5.
In the Arrhenius equation k = A e^(–Ea/RT), the factor A represents:
A.
rate of reaction at absolute zero
B.
activation energy
C.
fraction of effective collisions
D.
frequency factor (Arrhenius / pre-exponential factor)
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ANSWER :
D. frequency factor (Arrhenius / pre-exponential factor)
6.
In the Arrhenius equation, the term e^(–Ea/RT) represents:
A.
fraction of molecules with energy equal to or greater than the activation energy
B.
number of effective collisions per second
C.
fraction of molecules colliding with proper orientation
D.
total number of molecules per mole
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ANSWER :
A. fraction of molecules with energy equal to or greater than the activation energy