Chemistry
Grade-8
Easy
Question
When calcium carbonate is heated around 1000℃, it decomposes into :
- Calcium oxide
- Carbon dioxide
- Calcium hydroxide
- Calcium oxide and carbon dioxide
Hint:
In a decomposition reaction, the compounds break into simple substances.
The correct answer is: Calcium oxide and carbon dioxide
- Calcium carbonate decomposes into calcium oxide and carbon dioxide when heated. The complete decomposition of 10g of calcium carbonate produces 5.6g of calcium oxide
- A decomposition reaction is a reaction in which a compound is broken down into two or simpler substances.
- The general form of decomposition reactions is AB→A+B. Most decomposition reactions require energy input in the form of heat, light, or electricity.
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