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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:
(a) sulphur
(b) carbon
(c) calcium
(d) hydrogen
Solution
(b) carbon
Carbon forms two oxides, CO and CO2. The oxide CO is neutral and CO2 is acidic in nature.
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