Chemistry
Grade-8
Easy
Question
Copper carbonate decomposes by heating to give products as A and B. Identify the products ‘A’ and ‘B’ from the following.
- A= Copper Oxide, B = Carbon monoxide
- A = Copper Oxide, B = Carbon dioxide
- A= Carbonate, B = Carbon dioxide
- A= Copper, B= Carbon trioxide
Hint:
Thermal decomposition takes place when copper carbonate is heated
The correct answer is: A = Copper Oxide, B = Carbon dioxide
- When copper carbonate is heated, it decomposes into copper oxide and carbon dioxide
- This is an example of thermal decomposition because heat is required to decompose copper carbonate.
- When testing carbon dioxide, remember to do the lime water test followed by the acid potassium dichromate test. Both sulfur dioxide and carbon dioxide turn limewater milky, while sulfur dioxide solution turns acidified potassium chromate solution green, while carbon dioxide shows nothing.
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