is acid a nonmettalic oxide
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It's is generally agreed that non metallic oxides are acidic and metallic oxides are basic. However, they cannot be classified as acids.
For example, we know that acids and bases react to give salt and water.
Thus, Ca(OH)2 + CO2 →CaCO3 + H2O
Here, calcium hydroxide is a base and it reacts with carbon dioxide to form calcium carbonate and water. Thus, here the salt is calcium carbonate and the acid is CO2, wherein it is a oxide of the non metal, carbon. However, not all non metallic oxides are acidic, because CO or carbon monoxide is a neutral oxide. This exception also applies to metallic oxides. Al and Zn are exceptions which react like both acids and bases, hence called amphoteric metals. They behave like bases to acids and like acids to bases.
For example, we know that acids and bases react to give salt and water.
Thus, Ca(OH)2 + CO2 →CaCO3 + H2O
Here, calcium hydroxide is a base and it reacts with carbon dioxide to form calcium carbonate and water. Thus, here the salt is calcium carbonate and the acid is CO2, wherein it is a oxide of the non metal, carbon. However, not all non metallic oxides are acidic, because CO or carbon monoxide is a neutral oxide. This exception also applies to metallic oxides. Al and Zn are exceptions which react like both acids and bases, hence called amphoteric metals. They behave like bases to acids and like acids to bases.
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For example, we know that acids and bases react to give salt and water.
Thus, Ca(OH)2 + CO2 →CaCO3 + H2O