Question

Which one is an amorphous solid?
A.Diamond
B.Graphite
C.Common Salt
D.Glass

Answer 1

To answer this question, you should recall that Amorphous solid-state comprises those solids which have the property of rigidity and incompressibility but to a certain extent. The amorphous solid in the options is made of quartz and silica.

Complete step by step answer:
The major difference between crystalline and amorphous solids can be enumerated as:

Crystalline solids	Amorphous solids
Crystals have definite and regular geometry and have a long-range as well as short-range order of constituent particles.	The particles in the constituent are arranged irregularly. They do not have any definite geometry and have a short-range order.
Crystals possess high melting points.	They are devoid of sharp melting points.
The crystals' external forms have regularity when these are formed.	No external regularity in their form when these amorphous solids are formed.
They give a clean surface after cleavage with a knife.	Usually, the amorphous solids exhibit irregular cuts.
They have definite heat of fusion.	Amorphous solids do not possess any particular heat of fusion.
Crystalline solids are very rigid and their molecules cannot be deformed by mild distorting force.	Amorphous solids do not exhibit rigidity. The deformation could be done by bending or compressing them.
Crystalline solids are considered as true solid.	Amorphous solids are considered as supercooled liquids or also pseudo solids.
Crystalline solids display anisotropism.	Amorphous solids display isotropism.

Glass is an amorphous solid also known as a pseudo solid. Diamond, graphite and common salt are crystalline solids.

Hence, the correct answer to this question is option D.

Note:
You should know about different types of crystalline solids based on the nature of intermolecular forces. - Molecular Solids: In molecular solids the constituent particles are molecules.
- Ionic solids: In ionic solids the constituent particles are ions. These are formed by the arrangement of cations and anions by strong Coulombic forces.
- Metallic solids: Positive metal ions in a sea of delocalized electrons. These electrons are evenly spread out throughout the crystal.
- Covalent solids: A wide range of crystalline solids of non-metal form covalent bonds between adjacent atoms throughout the crystal and form a giant molecule or large molecules.