Chemical Equilibrium and Kinetics AFCAT Questions

AFCAT Chemistry

Chemical Equilibrium and Kinetics MCQ Questions


1.
At equilibrium, the rate of the forward reaction is ______ to the rate of the reverse reaction.
A.
Greater
B.
Less
C.
Equal
D.
Variable
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ANSWER :
C. Equal
2.
The equilibrium constant (K) is dependent on ______.
A.
Pressure
B.
Temperature
C.
Catalyst
D.
Concentration
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ANSWER :
B. Temperature
3.
For the reaction N₂ + 3H₂ ⇌ 2NH₃, increasing pressure will shift the equilibrium toward ______.
A.
Reactants
B.
Products
C.
No change
D.
Catalyst side
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ANSWER :
B. Products
4.
A catalyst affects the ______ of a chemical reaction.
A.
Activation energy
B.
Equilibrium constant
C.
Heat of reaction
D.
Volume of reaction
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ANSWER :
A. Activation energy
5.
The unit of the rate constant for a first-order reaction is ______.
A.
s⁻¹
B.
mol L⁻¹ s⁻¹
C.
L mol⁻¹ s⁻¹
D.
No unit
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ANSWER :
A. s⁻¹
6.
The rate-determining step of a reaction is the ______ step in the reaction mechanism.
A.
Fastest
B.
Intermediate
C.
Slowest
D.
Equilibrium
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ANSWER :
C. Slowest