chemistry : class11 Crystalline Solids : Melting point : States of Matter: Gases and Liquids MCQ Questions and Answers
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Crystalline Solids
MCQ questions and answers.
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MCQ Questions
1. Which property is generally characteristic of crystalline solids?
A.
They have a sharp melting point
B.
They melt over a wide temperature range
C.
They have no definite shape
D.
Their particles are arranged randomly
Correct Answer:
They have a sharp melting point
Explanation:
Crystalline solids possess a regular, repeating arrangement of particles, so they melt sharply at a definite temperature.
2. The sharp melting point of a crystalline solid is mainly due to its:
A.
Random particle arrangement
B.
Regular repeating structure
C.
Large volume
D.
Low density
Correct Answer:
Regular repeating structure
Explanation:
A regular crystal lattice gives particles similar surroundings and definite forces, causing melting to occur at a specific temperature.
3. What happens to a crystalline solid when it reaches its melting point?
A.
It changes directly into a gas
B.
It changes from solid to liquid
C.
It becomes an amorphous solid
D.
It loses all its particles
Correct Answer:
It changes from solid to liquid
Explanation:
At the melting point, the ordered arrangement of particles in a crystalline solid breaks sufficiently for the solid to become a liquid.
4. Which of the following is an example of a crystalline solid?
A.
Common salt
B.
Rubber
C.
Glass
D.
Plastic sheet
Correct Answer:
Common salt
Explanation:
Common salt has a regular three-dimensional arrangement of ions and therefore forms a crystalline solid.
5. A pure crystalline solid usually melts at:
A.
A definite temperature
B.
All temperatures equally
C.
A very wide range of temperatures
D.
Only room temperature
Correct Answer:
A definite temperature
Explanation:
The regular lattice of a pure crystalline solid breaks at a fixed temperature, called its melting point.
6. Which arrangement of particles is found in a crystalline solid?
A.
Long-range orderly arrangement
B.
Complete absence of arrangement
C.
Short-range disorder only
D.
Random arrangement throughout
Correct Answer:
Long-range orderly arrangement
Explanation:
Crystalline solids have particles arranged in a regular pattern that continues over long distances in the crystal.
7. Why does a crystalline solid retain a definite shape below its melting point?
A.
Its particles are fixed in an orderly lattice
B.
Its particles move freely in all directions
C.
It contains no intermolecular forces
D.
Its particles are widely separated
Correct Answer:
Its particles are fixed in an orderly lattice
Explanation:
In a crystalline solid, strong forces hold particles at fixed positions in an organized crystal lattice.
8. Which statement correctly compares crystalline solids with amorphous solids?
A.
Crystalline solids generally have sharp melting points
B.
Crystalline solids always soften gradually
C.
Crystalline solids have completely random structures
D.
Crystalline solids have no definite melting behavior
Correct Answer:
Crystalline solids generally have sharp melting points
Explanation:
The ordered structure of crystalline solids produces a definite melting point, unlike the gradual softening commonly shown by amorphous solids.
9. The temperature at which a crystalline solid changes into a liquid is called its:
A.
Boiling point
B.
Freezing point only
C.
Melting point
D.
Sublimation point
Correct Answer:
Melting point
Explanation:
The melting point is the definite temperature at which a crystalline solid changes from the solid state to the liquid state.
10. Which feature of crystalline solids makes their melting point easy to determine?
A.
They melt over a narrow temperature range
B.
They have no fixed particle arrangement
C.
They change into gas before melting
D.
They soften indefinitely without melting
Correct Answer:
They melt over a narrow temperature range
Explanation:
Because crystalline solids have an ordered lattice, they undergo melting sharply, usually over a very narrow temperature range.
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