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What is the chemical formula of quicklime?
CaCO3тАЛ
Ca(OH)2тАЛ
CaO
CaSO4тАЛ
CaO
Quicklime is the common name for calcium oxide, which has the chemical formula CaO. It is a widely used alkaline chemical compound produced by the thermal decomposition of limestone.
Quicklime is the common name for calcium oxide, which has the chemical formula CaO. It is a widely used alkaline chemical compound produced by the thermal decomposition of limestone.
Think of quicklime as a 'dry' battery of energy; when you add water, it releases heat, just like a heater turning on once plugged in.
CaO = 'Calcium Oxide' (C-A-O), which sounds like 'Ca-O'. Remember 'O' for 'Oxide'.
CaO тАФ Calcium oxide (Quicklime)
CaCO3тАЛ╬ФтАЛCaO+CO2тАЛ тАФ Calcination reaction
Quicklime is manufactured by the process of calcination, where calcium carbonate (CaCO3тАЛ) is heated to high temperatures (above 825┬░C). This reaction releases carbon dioxide, leaving behind calcium oxide: CaCO3тАЛтЖТCaO+CO2тАЛ. When water is added to quicklime, it undergoes an exothermic reaction to form slaked lime, Ca(OH)2тАЛ.
It is a caustic, crystalline, and alkaline substance at room temperature.
It is an important industrial commodity used in steel manufacturing and water treatment.
Efficient agent for pH adjustment
High reactivity with water
Highly corrosive to skin and eyes
Reacts exothermically with moisture causing potential burn risks
Production of cement and mortar
Water softening and purification
Option A (CaCO3тАЛ) is limestone/calcium carbonate.
Option B (Ca(OH)2тАЛ) is slaked lime or calcium hydroxide.
Option D (CaSO4тАЛ) is calcium sulfate, often found as gypsum.
C is correct тАФ Quicklime is chemically identified as calcium oxide (CaO).
Always differentiate between 'Quicklime' (CaO) and 'Slaked Lime' (Ca(OH)2тАЛ) as this is a frequent trap in RRB and SSC chemistry questions.
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