16. The chemical name of quartz is A.Calcium oxide B.Calcium phosphate C.Sodium phosphate D.Sodium silicate
Answer: Option D Solution: Quartz is a compound of one part silicon and two parts of oxygen, silicon dioxide, SiO2. Quartz is the most abundant silica mineral. It is used in a number of industries, the important being glass, foundry, sodium silicate, silicon alloys, etc. The various grades of sodium silicate are characterized by their SiO2:Na2O weight ratio.
