Chemical Equilibrium and Kinetics AFCAT Questions

AFCAT Chemistry

Chemical Equilibrium and Kinetics MCQ Questions


1.
At equilibrium in a physical process, which of the following is TRUE?
A.
Concentration of reactants becomes zero
B.
Forward process completely stops
C.
Reverse process becomes faster than forward
D.
Rate of forward process equals rate of reverse process
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ANSWER :
D. Rate of forward process equals rate of reverse process
2.
The equilibrium between ice and water at 273 K and 1 atm is an example of:
A.
Solid-solid equilibrium
B.
Solid-vapour equilibrium
C.
Solid-liquid equilibrium
D.
Liquid-vapour equilibrium
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ANSWER :
C. Solid-liquid equilibrium
3.
For any pure substance at atmospheric pressure, the temperature at which solid and liquid phases are at equilibrium is called:
A.
Normal boiling point
B.
Triple point
C.
Critical temperature
D.
Normal melting point
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ANSWER :
D. Normal melting point
4.
The equilibrium vapour pressure of a liquid in a closed container depends on:
A.
Volume of the container only
B.
Surface area of the liquid only
C.
Nature of the liquid and temperature
D.
Amount of the liquid only
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ANSWER :
C. Nature of the liquid and temperature
5.
Which liquid will have the lowest boiling point?
A.
The one with the lowest vapour pressure
B.
The one with the highest molecular mass
C.
The one with the highest density
D.
The one with the highest vapour pressure at a given temperature
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ANSWER :
D. The one with the highest vapour pressure at a given temperature
6.
Why is it not possible to reach equilibrium in an open system for liquid-vapour transition?
A.
Evaporation does not occur in open systems
B.
Liquids do not have vapour pressure in open air
C.
Temperature keeps changing
D.
Vapour molecules disperse into the surroundings, so rate of condensation cannot equal rate of evaporation
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ANSWER :
D. Vapour molecules disperse into the surroundings, so rate of condensation cannot equal rate of evaporation