Question

Amorphous solids are:
(A) Solid substances in real sense
(B) Liquids in real sense
(C) Supercooled liquids
(D) Substances with definite melting point

Answer 1

Hint: To know about the amorphous solids, we will go through its structure and properties, because the chemical properties of any substance or solids depends on their physical properties or their shape and structure. So, the melting point of amorphous solids is not so sharp.

Complete answer:
Amorphous solids are supercooled liquids and they are irregularly arranged in the nature of their structure. They never possess a definite melting point.
An amorphous or non-crystalline solid is one that lacks the long-range organisation that characterises crystals in condensed matter physics and materials science. The phrase has been used interchangeably with glass in certain earlier books. Nowadays, the overarching idea is "glassy solid" or "amorphous solid," with glass being the more specific case: Glass is an amorphous material that has been stabilised at a temperature lower than its glass transition temperature. Amorphous polymers are common. Gels, thin films, and nanostructured materials like glass are examples of amorphous solids.
The internal structure of amorphous materials is made up of interconnecting structural pieces. These blocks may resemble the basic structural units seen in the compound's corresponding crystalline phase. The degree of connectedness between a material's primary building blocks determines whether it is liquid or solid; solids have a high degree of connectivity, whereas structural blocks in fluids have a lesser degree of connectivity.
Hence, the correct option is (C) Supercooled liquids.

Note:
Amorphous solids do not have a distinct melting point and melt across a wide temperature range. Glass, for example, softens and eventually melts over a temperature range when heated. As a result, glass can be moulded or blown into a variety of shapes. The heat of fusion is absent in amorphous solids.