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Reaction of Metals with Acid

Explain the f...

Question

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

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Solution

Aluminium becomes passive when comes in contact with conc. HNO3 due to formation of coating of Al2O3 and so becomes inert to other reactions. Therefore, Reactivity of aluminium decreases if it is 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. Assertion :Reactivity of Al decreases if it is dipped in

H N O_{3}

. Reason: Nitric acid is a good oxidising agent, and so this causes a thickening of the oxide layer, further protecting the aluminium from reaction.

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

H N O_{3}

?

Aluminium's reactivity decreases when dipped in HNO₃

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Reaction of Metals with Acid

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