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Question
An element X forms two oxides XO and XO2. The oxide XO is neutral but XO2 is acidic in nature. The element X is most likely to be ______.
Options
sulphur
carbon
calcium
hydrogen
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Solution
An element X forms two oxides XO and XO2. The oxide XO is neutral but XO2 is acidic in nature. The element X is most likely to be carbon.
Explanation:
Carbon (element X) forms carbon monoxide (CO), which is a neutral oxide that does not react with acids or bases. It also forms carbon dioxide (CO2), which dissolves in water to form carbonic acid, making it acidic. In contrast, sulphur only forms acidic oxides (SO2 and SO3), calcium forms a basic oxide (CaO), and hydrogen forms a neutral oxide (H2O).
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