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Question: Answered & Verified by Expert
Assertion : Al becomes passive in conc. $\mathrm{HNO}_3$.
Reason: Conc. $\mathrm{HNO}_3$ has no action on aluminium metal.
Chemistryp Block Elements (Group 15, 16, 17 & 18)AIIMSAIIMS 2014
Options:
  • A If both assertion and reason are true and reason is the correct explanation of assertion.
  • B If both assertion and reason are true but reason is not the correct explanation of assertion.
  • C If assertion is true but reason is false.
  • D If both assertion and reason are false.
Solution:
1368 Upvotes Verified Answer
The correct answer is: If assertion is true but reason is false.
Al metal is rendered passive when treated with conc. $\mathrm{HNO}_3$ because concentrated $\mathrm{HNO}_3$ is oxidising agent and produces a protective layer of oxide on the surface.

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