Assertion : Al becomes passive in conc. HNO3.
Assertion : Al becomes passive in conc. HNO3.
Reason : Conc. HNO3 has no action on aluminium metal.
(a) Both A and R are true and R is the correct explanation of A
(b) Both A and R are true but R is not correct explanation of A
(c) A is true but R is false
(d) A and R are false
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Correct option (c) A is true but R is false
Explanation:
Al metal is rendered passive when treated with conc. HNO3 because concentrated HNO3 is oxidising agent and produces a protective layer of oxide on the surface of aluminium metal.
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