Which of the following compounds undergoes thermal decomposition to produce calcium oxide and carbon dioxide?

Question

Question

This question was previously asked in

RRB Technician Grade III Official Paper (Held On: 28 Dec, 2024 Shift 2)

Answer 1

The correct answer is Calcium Carbonate.

Key Points

Calcium carbonate (CaCO₃) decomposes upon heating to produce calcium oxide (CaO) and carbon dioxide (CO₂).
The thermal decomposition reaction of calcium carbonate is: CaCO₃ (s) → CaO (s) + CO₂ (g).
This decomposition occurs at a temperature of about 825°C (1517°F).
Calcium oxide (CaO), also known as quicklime, is widely used in construction and industrial processes.

Additional Information

Thermal Decomposition:
- It is a chemical reaction where a compound breaks down into simpler compounds or elements upon heating.
- Thermal decomposition reactions are usually endothermic, meaning they absorb heat.
Calcium Oxide (CaO):
- Also known as quicklime or burnt lime.
- Used in the manufacture of cement, steel, and paper, and in water treatment.
Carbon Dioxide (CO₂):
- A colorless, odorless gas that is a byproduct of the respiration of living organisms and the combustion of fossil fuels.
- It is used in the production of carbonated beverages, as a refrigerant, and in fire extinguishers.
Other Thermal Decomposition Examples:
- Calcium nitrate (Ca(NO₃)₂) decomposes to calcium oxide (CaO), nitrogen dioxide (NO₂), and oxygen (O₂).
- Calcium sulfate (CaSO₄) decomposes to calcium oxide (CaO) and sulfur trioxide (SO₃).