Chemical Equilibrium and Kinetics AFCAT Questions

AFCAT Chemistry

Chemical Equilibrium and Kinetics MCQ Questions


13.
Which of the following is NOT a characteristic of a system at physical equilibrium?
A.
All measurable properties remain constant
B.
Equilibrium occurs only in closed systems
C.
Measurable properties of the system change continuously
D.
Both opposing processes occur at the same rate
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ANSWER :
C. Measurable properties of the system change continuously
14.
The dynamic nature of equilibrium in a saturated sugar solution can be confirmed using:
A.
An ammeter
B.
A barometer
C.
A pH meter
D.
Radioactive sugar molecules
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ANSWER :
D. Radioactive sugar molecules
15.
In a saturated solution at constant temperature:
A.
Rate of dissolution equals rate of crystallization
B.
Dissolution stops completely
C.
Both processes stop
D.
Crystallization stops completely
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ANSWER :
A. Rate of dissolution equals rate of crystallization
16.
At chemical equilibrium, which statement is correct?
A.
Reverse reaction stops
B.
Concentrations of reactants and products remain constant
C.
Forward reaction stops
D.
Reactants are completely converted to products
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ANSWER :
B. Concentrations of reactants and products remain constant
17.
The Haber's process for ammonia synthesis is represented by:
A.
N₂(g) + 2H₂(g) ⇌ NH₃(g)
B.
N₂(g) + H₂(g) ⇌ 2NH₃(g)
C.
2N₂(g) + 3H₂(g) ⇌ 2NH₃(g)
D.
N₂(g) + 3H₂(g) ⇌ 2NH₃(g)
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ANSWER :
D. N₂(g) + 3H₂(g) ⇌ 2NH₃(g)
18.
The use of Dâ‚‚ instead of Hâ‚‚ in ammonia synthesis demonstrates that:
A.
The reaction is irreversible
B.
Equilibrium constants change with isotopes
C.
Chemical equilibrium is dynamic with continuous forward and reverse reactions
D.
Deuterium is a better reactant than hydrogen
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ANSWER :
C. Chemical equilibrium is dynamic with continuous forward and reverse reactions