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Which of the following on thermal decomposition yields a basic as well as acidic oxide ?

1. NaNO3
2. KClO3
3. CaCO3
4. NH4NO3

Correct answer: CaCO3

Solution

Calcium carbonate (CaCO3) decomposes upon heating to produce calcium oxide (CaO), which is a basic oxide, and carbon dioxide (CO2), which can form carbonic acid in solution, thus yielding both a basic and an acidic oxide.

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