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Explain the Following: Reactivity of Aluminium Decrease If It is Dipped in Nitric Acid. - Science

Question

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Explain the following: 

Reactivity of aluminium decrease if it is dipped in nitric acid.

Solution

When aluminium is dipped in nitric acid a layer of aluminium oxide is formed on the metal. This happens because nitric acid is a strong oxidizing agent. The layer of aluminium oxide prevents further reaction of aluminium. Due to this, the reactivity of aluminium decreases. 

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