Elementary Idea of Metallic Bonding NEET Questions

Physical Chemistry - Chemical Bonding and Molecular Structure

Elementary Idea of Metallic Bonding MCQ Questions


13.
The bonding in solid sodium is best described as:
A.
Covalent Na–Na bonds in a tetrahedral network
B.
Hydrogen-bonded sodium clusters
C.
Ionic bonds between Na+ and Na– species
D.
Each Na+ kernel surrounded by a sea of delocalised electrons contributed by all sodium atoms
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ANSWER :
D. Each Na+ kernel surrounded by a sea of delocalised electrons contributed by all sodium atoms
14.
Which of the following CANNOT be explained satisfactorily by the electron sea model alone?
A.
Why metals conduct electricity
B.
Why metals possess metallic lustre
C.
Why metals are malleable and ductile
D.
The distinction between conductors, semiconductors, and insulators
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ANSWER :
D. The distinction between conductors, semiconductors, and insulators
15.
Mercury is a liquid at room temperature whereas other transition metals are solids. This indicates that mercury has:
A.
No bonding between Hg atoms in the bulk state
B.
Purely covalent bonding between Hg atoms
C.
Relatively weak metallic bonding compared to other transition metals
D.
Stronger metallic bonding than tungsten
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ANSWER :
C. Relatively weak metallic bonding compared to other transition metals
16.
The melting points of alkali metals decrease down the group (Li > Na > K > Rb > Cs) because:
A.
The number of valence electrons decreases down the group
B.
The size of the metal kernel increases down the group, weakening the attraction with the electron sea
C.
The metallic bonds become more directional down the group
D.
The electronegativity increases down the group
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ANSWER :
B. The size of the metal kernel increases down the group, weakening the attraction with the electron sea
17.
Which of the following best explains why metals are good conductors of heat?
A.
Metal kernels migrate from hot to cold regions carrying thermal energy
B.
Heat is conducted through covalent bond vibrations only
C.
Free electrons gain kinetic energy from the hot region and transfer it rapidly to cooler regions through collisions
D.
Metallic bonds expand on heating, transferring heat as elastic waves
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ANSWER :
C. Free electrons gain kinetic energy from the hot region and transfer it rapidly to cooler regions through collisions
18.
The number of valence electrons contributed by each atom of magnesium to the electron sea is:
A.
2
B.
0
C.
3
D.
1
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ANSWER :
A. 2