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Give a chemical reaction to prove that non-metallic oxides are acidic in nature.

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Consider the following reaction,

Ca(OH)2 + CO2 → CaCO3 + H2O

(non metallic oxide)

Here, calcium hydroxide (Ca(OH)2) is a base, and it reacts with carbon dioxide (CO2) to give salt (calcium carbonate) and water. Comparing the above reaction with, 

Base + Acid → Salt + Water 

One can see that CO2 acts as an acid. Hence, one can prove that non-metallic oxides are acidic in nature.

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