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NEET2014Chemistryp Block Elements (Group 15, 16, 17 & 18)Actual

Assertion : Al becomes passive in conc. HNO ₃ . Reason: Conc. HNO ₃ has no action on aluminium metal.

Options

  1. AIf both assertion and reason are true and reason is the correct explanation of assertion.
  2. BIf both assertion and reason are true but reason is not the correct explanation of assertion.
  3. CIf assertion is true but reason is false.
  4. DIf both assertion and reason are false.

Correct answer

C. If assertion is true but reason is false.

Step-by-step solution

Al metal is rendered passive when treated with conc. HNO ₃ because concentrated HNO ₃ is oxidising agent and produces a protective layer of oxide on the surface.

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