Equilibrium Involving Physical Processes (Solid-Liquid, Liquid - Gas and Solid-Gas Equilibria, Henry's Law...) NEET Questions

Physical Chemistry - Equilibrium

Equilibrium Involving Physical Processes (Solid-Liquid, Liquid - Gas and Solid-Gas Equilibria, Henry's Law...) MCQ Questions


1.
Ice and water are in equilibrium at 273 K and 1 atm pressure in a perfectly insulated thermos flask. Which statement is correct?
A.
All ice converts to water within minutes
B.
Both masses remain constant though molecules continuously exchange between phases
C.
Mass of water continuously increases
D.
Mass of ice continuously decreases
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ANSWER :
B. Both masses remain constant though molecules continuously exchange between phases
2.
The temperature at which solid and liquid phases of a pure substance coexist in equilibrium at atmospheric pressure (1.013 bar) is called:
A.
Critical point
B.
Normal melting point (or normal freezing point)
C.
Boiling point
D.
Triple point
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ANSWER :
B. Normal melting point (or normal freezing point)
3.
For solid-liquid equilibrium of a pure substance, which is true?
A.
It exists at any temperature
B.
It exists only at the melting point at given pressure
C.
Mass of solid is always greater than mass of liquid
D.
It cannot occur in a closed system
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ANSWER :
B. It exists only at the melting point at given pressure
4.
Which of the following statements about ice-water equilibrium is INCORRECT?
A.
It can be established only at high pressure
B.
There is intense molecular activity at the boundary
C.
Rate of melting equals rate of freezing
D.
It is dynamic in nature
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ANSWER :
A. It can be established only at high pressure
5.
The boiling point of water decreases at high altitude because:
A.
Atmospheric pressure decreases with altitude
B.
Water is purer at high altitude
C.
Temperature is lower at high altitude
D.
Air is thinner at high altitude
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ANSWER :
A. Atmospheric pressure decreases with altitude
6.
When a liquid is in equilibrium with its vapor in a closed container at constant temperature:
A.
Rate of evaporation > rate of condensation
B.
Rate of evaporation < rate of condensation
C.
Rate of evaporation = rate of condensation
D.
Both processes have stopped
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ANSWER :
C. Rate of evaporation = rate of condensation