Equilibrium NDA Questions

NDA Chemistry

Equilibrium MCQ Questions


1.
A state of dynamic equilibrium is one in which:
A.
All physical and chemical processes have completely stopped
B.
The forward and reverse processes occur at equal rates, so the observable properties remain constant
C.
Only the forward process continues to occur
D.
The system has reached its lowest possible energy state with no further change possible
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ANSWER :
B. The forward and reverse processes occur at equal rates, so the observable properties remain constant
2.
In a closed vessel containing water and its vapour at a fixed temperature, equilibrium is attained when:
A.
All the water evaporates completely
B.
No water molecules escape into the vapour phase
C.
The rate of evaporation exceeds the rate of condensation
D.
The rate of evaporation equals the rate of condensation
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ANSWER :
D. The rate of evaporation equals the rate of condensation
3.
The pressure exerted by the vapour of a liquid when it is in equilibrium with its own liquid at a given temperature is called:
A.
Vapour pressure
B.
Atmospheric pressure
C.
Osmotic pressure
D.
Partial pressure
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ANSWER :
A. Vapour pressure
4.
Which of the following statements about the equilibrium between a solid and its saturated solution (e.g., sugar and sugar solution) is correct?
A.
Only dissolution occurs, no crystallisation takes place
B.
The amount of undissolved solid keeps increasing
C.
The rate of dissolution equals the rate of crystallisation (recrystallisation)
D.
The concentration of the solute in solution keeps increasing indefinitely
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ANSWER :
C. The rate of dissolution equals the rate of crystallisation (recrystallisation)
5.
According to Henry's law, the equilibrium between a gas and its solution is governed by the fact that, at a given temperature:
A.
Gases never dissolve in liquids at equilibrium
B.
The solubility of a gas in a liquid is independent of pressure
C.
Solubility of a gas decreases with increasing pressure
D.
The mass of a gas dissolved per unit volume of solvent is proportional to the pressure of the gas above the solvent
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ANSWER :
D. The mass of a gas dissolved per unit volume of solvent is proportional to the pressure of the gas above the solvent
6.
For a general physical equilibrium process, which characteristic feature is common to all such equilibria?
A.
The system must be open to the surroundings
B.
Equilibrium is possible only in a closed system, and it can be approached from either direction
C.
Equilibrium is possible only at absolute zero temperature
D.
Equilibrium can only be reached from the forward direction
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ANSWER :
B. Equilibrium is possible only in a closed system, and it can be approached from either direction