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Electronic Configuration of d- Block

Why does the ...

Question

Why does the reactivity of aluminum decreases when dipped in nitric avid

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Solution

Nitric acid is an oxidising agent. Aluminium after reacting with nitric acid oxidised into aluminium oxidised.
2Al(s) + 6HNO₃ (aq) —> 2Al(NO₃)₃ (aq) + 3H₂(g)
So that after oxidation a layer of aluminium oxide form on the surface of aluminium which prevent it from further reaction. Hence reactivity of the aluminium decreases when dipped in nitric acid.

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Q. Assertion :Reactivity of aluminium decreases when it is dipped in nitric acid. Reason: A protective layer of aluminium nitrate is formed when aluminium is dipped in nitric acid.

Q. Which of the following is true about the two statements?

S t a t e m e n t I :

Reactivity of aluminium decreases when it is dipped in nitric acid

S t a t e m e n t I I :

A protective layer of aluminium nitrate is formed when aluminium is dipped in nitric acid

Q. Explain the following
Reactivity of aluminium decreases if it is dipped in nitric acid.

Aluminium's reactivity decreases when dipped in HNO₃

Q. Why the reactivity of a piece of aluminium metal decreases if it is dipped in

H N O_{3}

?

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