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NDA 2017 GAT · General Knowledge · Chemistry in Everyday Life · easy

The chemical formula of quicklime is

Single correct option

The chemical formula of quicklime is
  1. A. Ca(OH)2
  2. B. CaCO3
  3. C. CaCl2
  4. D. CaO
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Answer: (D) CaO

Quicklime is calcium oxide, CaO, obtained by heating limestone (CaCO3), which also releases carbon dioxide. When water is added it reacts vigorously to give slaked lime, Ca(OH)2, with release of heat. Limestone is CaCO3 and CaCl2 is calcium chloride, a drying agent. These are the substances that students commonly mix up.
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Original question written in the NDA 2017 GAT pattern and checked twice for the correct answer. Not an official question paper. How we write and check questions · Corrections policy · Report a mistake