Question

The chemical formula of Quick Lime (Kalichuna) is ______.
1. CaCO₃
2. CaCI₂
3. Ca(OH)₂
4. CaO
5. CaCl

Answer 1

Correct Answer - Option 4 : CaO

The correct answer is CaO.

• Compound name- Calcium Oxide. 
• It is also known as quick lime or burnt lime.

• Calcium Oxide is one of the oldest chemicals known to humans.
• Properties of Calcium Oxide.
  • It is an amorphous solid.
  • It has a melting point of 2572°C.
  • It is a very stable compound and withstands high temperatures.
• It is prepared from Calcium Carbonate.
  • CaCO₃ → CaO + CO₂
• Uses of Calcium Oxide.
  • It is extensively used for medicinal purposes and insecticides.
  • It is used in the manufacturing of cement, paper, and high-grade steel.
  • It is used as a reagent in laboratories for dehydration, precipitation reaction, etc.

CaCO3	Compound name- Calcium Carbonate Uses- Cement and Steel manufacturing, Healthcare, Plastic and rubber manufacturing.
CaCI2	Compound name- Calcium Chloride Uses- Production of activated charcoal, the electrolyte in sports drinks, deicing.
Ca(OH)2	Compound name- Calcium Hydroxide  (slaked lime) Uses- paper production, food processing, sewage treatment, construction.