Which of the following is commonly known as Quicklime?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. CaO.
Quicklime is a white, caustic, alkaline substance that is produced by heating limestone (calcium carbonate, CaCO₃) in a process called calcination. This process removes carbon dioxide, leaving behind calcium oxide. Quicklime is widely used in construction for making cement, in chemical manufacturing, and in various industrial processes such as steelmaking, water treatment, and soil stabilization. It reacts vigorously with water to form calcium hydroxide, also known as slaked lime.