Question

• classify the folowing solids on the nature of intermolecular forces operating in them-

potassium sulphate, tin, benzene, urea, ammonia, water, zinc sulphide, graphite , rubidium, argon, silicon carbide

• classify the following solids as amorphousor crystalline-

napthalene, benzoic acid, teflon, potassium nitrate, celllophane, polyvinyl chloride, fibre glass,copper,polyurethane

Answer 1

The classification can be done as following:

Ionic: Potassium sulphate, zinc sulphide

Covalent: Graphite, Silicon carbide

Molecular: Benzene, urea, argon, ammonia

Hydrogen bonding: Water

Metallic: Rubidium, tin.

The solids can be classified as:

Amorphous: polyurethane, teflon, cellophane, polyvinyl chloride and fibre glass.

Crystalline: Naphthalene, benzoic acid, potassium nitrate and copper.