Which of the following is the chemical formula of quicklime ?
CaO
Quicklime (unslaked lime) is calcium oxide. It is made by heating limestone: CaCO3 → CaO + CO2.
When water is added to quicklime it forms slaked lime, Ca(OH)2, with release of heat. CaCO3 is limestone and CaCl2 is calcium chloride, so these are different compounds.
So the formula of quicklime is that of calcium oxide.
Hence, CaO.
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