chemistry : class11 Metallic Solids : Melting point : States of Matter: Gases and Liquids MCQ Questions and Answers
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Metallic Solids
MCQ questions and answers.
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MCQ Questions
1. Which type of solid generally contains positive metal ions surrounded by a sea of delocalized electrons?
A.
Metallic solid
B.
Ionic solid
C.
Molecular solid
D.
Covalent network solid
Correct Answer:
Metallic solid
Explanation:
A metallic solid consists of metal atoms whose valence electrons are delocalized throughout the structure, forming metallic bonding.
2. The melting point of a metallic solid mainly depends on the strength of its:
A.
Metallic bonding
B.
Hydrogen bonding
C.
Dipole-dipole attraction
D.
London dispersion force
Correct Answer:
Metallic bonding
Explanation:
Stronger metallic bonding holds the metal atoms more tightly and generally requires more heat to melt the solid.
3. Which of the following metals has the highest melting point?
A.
Tungsten
B.
Mercury
C.
Gallium
D.
Cesium
Correct Answer:
Tungsten
Explanation:
Tungsten has very strong metallic bonding and therefore has a much higher melting point than the other listed metals.
4. Which metal is liquid at room temperature because it has a very low melting point?
A.
Mercury
B.
Iron
C.
Copper
D.
Aluminium
Correct Answer:
Mercury
Explanation:
Mercury is a metallic element with a melting point below room temperature, so it exists as a liquid under ordinary conditions.
5. What generally happens to the melting point of a metallic solid when its metallic bonding becomes stronger?
A.
It increases
B.
It decreases
C.
It becomes zero
D.
It remains exactly unchanged
Correct Answer:
It increases
Explanation:
Stronger metallic bonding requires more thermal energy to separate the metal atoms, leading to a higher melting point.
6. Which of the following is a metallic solid at room temperature?
A.
Copper
B.
Sulfur
C.
Iodine
D.
Phosphorus
Correct Answer:
Copper
Explanation:
Copper is a metal composed of a lattice of metal atoms bonded by delocalized electrons, making it a metallic solid.
7. Why do most metallic solids have higher melting points than mercury?
A.
They usually have stronger metallic bonding
B.
They contain hydrogen bonds
C.
They are made of separate molecules
D.
They have no attraction between particles
Correct Answer:
They usually have stronger metallic bonding
Explanation:
Most metals are held together more strongly than mercury, so more heat is needed to overcome their metallic bonding during melting.
8. An alloy is best described as:
A.
A mixture containing a metal and one or more other elements
B.
A pure nonmetallic molecular solid
C.
A single noble gas atom
D.
A compound containing only hydrogen and oxygen
Correct Answer:
A mixture containing a metal and one or more other elements
Explanation:
Alloys are metallic materials formed by combining a metal with other elements, and their melting points can differ from those of the pure metals.
9. Which statement about the melting points of metals is correct?
A.
All metals have the same melting point
B.
Different metals can have different melting points
C.
Every metal melts below room temperature
D.
Metallic solids do not melt when heated
Correct Answer:
Different metals can have different melting points
Explanation:
Metallic solids have different atomic structures and bonding strengths, so their melting points are not the same.
10. When a metallic solid melts, what mainly happens to its particles?
A.
The ordered metallic structure becomes less ordered
B.
The metal atoms change into nonmetal atoms
C.
The metal atoms disappear
D.
The nuclei split into electrons
Correct Answer:
The ordered metallic structure becomes less ordered
Explanation:
On melting, thermal energy weakens the fixed arrangement of the metallic lattice, allowing the metal particles to move more freely.
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