Which among the following is known as quicklime?
- ACaCO3
- BCa(OH)2
- CCaCl2
- DCaO
- ENone of the above/More than one of the above
Show answer and explanation
Correct answer: (d) CaO
Explanation
Quicklime is the common name for Calcium oxide (CaO), a white, caustic, alkaline solid.
It is made by heating limestone: CaCO3 → CaO + CO2.
Adding water to CaO gives Ca(OH)2 (slaked lime), so the other options are distractors.