Question : Which of the following is commonly known as quicklime?
Option 1: CaSO4
Option 2: CaCl2
Option 3: Ca(OH)2
Option 4: CaO
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Correct Answer: CaO
Solution : The correct answer is CaO.
Calcium oxide (CaO) is commonly known as quicklime. Quicklime is a white, crystalline solid at room temperature and is produced by heating calcium carbonate (CaCO 3 ), typically in the form of limestone, in a process called calcination. The chemical reaction is as follows:
CaCO 3 → CaO + CO 2
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