Q115
General ScienceChemistry
Which one among the following is the main ingredient in cement?
- a.Gypsum
- b.Limestone
- c.Clay
- d.Ash
Answer: (B) Limestone
Limestone (calcium carbonate) is the principal raw material in cement manufacturing, providing the calcium oxide that reacts with clay-derived silica and alumina during clinker formation; gypsum is added only in small amounts afterward to control the setting time.