GENERAL KNOWLEDGE

Detailed explanation-1: -The correct answer is crystalline or amorphous. Solids can be classified as crystalline or amorphous based on the nature of order present in the arrangement of their constituent particles.

Detailed explanation-2: -Classification of the given compounds as amorphous or crystalline solids: Amorphous solids: Polyurethane, Cellophane, Polyvinyl Chloride, Fiberglass, Teflon. Crystalline solids: Naphthalene, Benzoic acid, Potassium nitrate, and Copper.

Detailed explanation-3: -Crystalline solids are true solids, have a regular arrangement of particles (long range order) whereas amorphous solids have an irregular arrangement of particles ( short range order). Due to this, crystalline solids are true solids and amorphous solids are pseudo solids.

Detailed explanation-4: -amorphous solid, any noncrystalline solid in which the atoms and molecules are not organized in a definite lattice pattern. Such solids include glass, plastic, and gel. Solids and liquids are both forms of condensed matter; both are composed of atoms in close proximity to each other.

Detailed explanation-5: -Crystalline solids, or crystals, are regarded as “true solids.” Minerals are crystalline solids. Common table salt is one example of this kind of solid. In crystalline solids, the atoms, ions or molecules are arranged in an ordered and symmetrical pattern that is repeated over the entire crystal.