An element forms an oxide A2O3 which is acidic in nature. Identify A as metal or non-metal.


Since an element’s oxide is acidic in nature, A will be a non-metal because the acidity of non-metal oxides is usually measured in terms of the acidic solutions generated when they react with water.

Non-metallic oxides

Non-metallic oxides are formed by the reaction of non-metals with oxygen. They react with a base to give salts and water. Let us consider the Calcium hydroxide (base) reaction with carbon dioxide (non-metallic oxide) to produce salt and water.

Ca(OH)2 + CO2 → CaCO3 + H2O

Other examples of non-metallic oxides – CO, NO2, Cl2O, XeO4

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