SET-8 Chemistry MCQs | Objective Type Questions

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Chemistry MCQs | Objective Type Questions | MCQs SET-8

Chemistry Questions and Answers – Amorphous and Crystalline Solids

1. The unit cell with a≠b≠c and α=γ=90, β≠90 refers to __________crystal system.

a) cubic
b) tetragonal
c) monoclinic
d) triclinic

Answer: c
Explanation: In monoclinic crystal system, all the three axes are unequal in length and two axes are perpendicular to each other. Gypsum and borax are examples of monoclinic crystals.

2. Which type of solid crystals will conduct heat and electricity?
a) Ionic
b) Covalent
c) Molecular
d) Metallic

Answer: d
Explanation: Metallic crystals consist of metal cations surrounded by a sea of mobile valence electrons. These electrons are capable of moving through the entire crystal. The metallic crystals conduct heat and electricity due to the presence of these mobile electrons in them.

3. Which is not a characteristic of crystalline solids?
a) They undergo a clean cleavage
b) They are true solids
c) They are isotropic
d) They have sharp melting points

Answer: c
Explanation: Amorphous solids are isotropic that is they have identical properties in all directions, whereas crystalline solids are anisotropic that is they have different properties in different directions.

4. Which of the following is a characteristic of amorphous solid?
a) They are true solids
b) They have sharp melting points
c) They undergo clear cleavage
d) They are isotropic

Answer: d
Explanation: Amorphous solids are isotropic that is they have identical properties in all directions. The remaining options are the characteristics of crystalline solids.

5. Solids are classified as ___________
a) crystalline and ionic solids
b) metallic and amorphous solids
c) molecular and covalent solids
d) crystalline and amorphous solids

Answer: d
Explanation: Based on their crystal structures, solids are classified as crystalline and amorphous solids. In crystalline solids, the constituent particles are arranged in a regular manner. In amorphous solids, the constituent particles are not arranged in any regular manner.

6. Quartz is an example of ___________
a) molecular solids
b) ionic solids
c) covalent solids
d) metallic solids

Answer: c
Explanation: Quartz is a common example of covalent solids. In covalent solids, the constituent particles are attached to each other by covalent bonds. Diamond, graphite, silicon are other examples of covalent solids.

7. Solid carbon dioxide is an example of _________
a) metallic crystal
b) covalent crystal
c) ionic crystal
d) molecular crystal

Answer: d
Explanation: Solid CO₂ is an example of molecular crystal. These solids have molecules as their constituent particles. These solids may be bonded by vander waals’ forces or by dipole-dipole attraction or by strong hydrogen bonds. H₂, Cl₂, I₂ are some examples of molecular solids.

8. Following elements have face-centered cubic structure

A. Gamma iron (910°C to 1400°C), Cu, Ag, Au, Al, Ni, Pb, Pt

B. Mg, Zn, Ti, Zr, Br, Cd

C. A iron (below 910°C and between 1400°C to 1539°C), W

D. All of the above

Answer: A

Explanation: This following elements have face-centered cubic structure:

Gamma iron (910°C to 1400°C), Cu, Ag, Au, Al, Ni, Pb, Pt.

9. The crystal structure of brass is

A. F.C.C.

B. B.C.C.

C. H.C.P.

D. Orthorhombic crystalline structure

Answer: A

Explanation: The crystal structure of brass is F.C.C.

Face-centered cubic (fcc or cF) refers to a crystal structure consisting of an atom at each cube corner and an atom in the center of each cube face.

10. Lattice points have another name which is called

A. lattice sites

B. lattice arrangements 

C. lattice circles 

D. lattice array

Answer: A

Explanation: Each point in a lattice is called a lattice point or lattice site.