The Concept of Dynamic Equilibrium NEET Questions

Physical Chemistry - Equilibrium

The Concept of Dynamic Equilibrium MCQ Questions


13.
Equilibrium cannot be established in:
A.
An open beaker containing water exposed to atmosphere
B.
A closed container with iodine crystals and iodine vapor
C.
A sealed flask containing water and water vapor
D.
A saturated solution of NaCl with excess solid NaCl
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ANSWER :
A. An open beaker containing water exposed to atmosphere
14.
At chemical equilibrium, which of the following is true?
A.
ΔG = 0 and ΔH = 0
B.
ΔG = 0 and rate of forward = rate of reverse reaction
C.
ΔG > 0 and reaction is spontaneous
D.
ΔS = 0 always
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ANSWER :
B. ΔG = 0 and rate of forward = rate of reverse reaction
15.
The equilibrium constant for a reaction depends on:
A.
Presence of catalyst
B.
Temperature
C.
Initial concentrations of reactants
D.
Pressure
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ANSWER :
B. Temperature
16.
If the rate of forward reaction is greater than the rate of reverse reaction:
A.
The system has not yet reached equilibrium and is moving toward products
B.
Kc = 0
C.
The system is at equilibrium
D.
The reaction has stopped
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ANSWER :
A. The system has not yet reached equilibrium and is moving toward products
17.
Equilibrium can be approached from:
A.
Either reactants or products side, giving same equilibrium composition
B.
Only the reactant side
C.
Only the product side
D.
Neither side once disturbed
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ANSWER :
A. Either reactants or products side, giving same equilibrium composition
18.
Which graph correctly represents the change in concentration with time for a reaction A + B → C + D approaching equilibrium?
A.
[A] and [B] decrease, [C] and [D] increase until all become constant
B.
All concentrations decrease until zero
C.
[A] and [B] increase, [C] and [D] decrease until constant
D.
All concentrations increase simultaneously
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ANSWER :
A. [A] and [B] decrease, [C] and [D] increase until all become constant