Which gas is released when calcium carbonate is heated?

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Multiple Choice

Which gas is released when calcium carbonate is heated?

Explanation:
When carbonates are heated, they break down into a metal oxide plus carbon dioxide gas. For calcium carbonate, this means it decomposes to calcium oxide and carbon dioxide. The gas released is carbon dioxide, shown by the typical decomposition equation: CaCO3(s) → CaO(s) + CO2(g). You can confirm CO2 with a limewater test, which turns cloudy due to CO2 forming calcium carbonate. The other gases listed don’t come from heating calcium carbonate in this way.

When carbonates are heated, they break down into a metal oxide plus carbon dioxide gas. For calcium carbonate, this means it decomposes to calcium oxide and carbon dioxide. The gas released is carbon dioxide, shown by the typical decomposition equation: CaCO3(s) → CaO(s) + CO2(g). You can confirm CO2 with a limewater test, which turns cloudy due to CO2 forming calcium carbonate. The other gases listed don’t come from heating calcium carbonate in this way.

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