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AIIMS 2014
Exam
AIIMS
Year
2014
Subject
Chemistry
Chapter
p Block Elements (Group 15, 16, 17 & 18)

AIIMS 2014 · Chemistry · p Block Elements (Group 15, 16, 17 & 18)

Assertion : Al becomes passive in conc. HNO_3 . Reason: Conc. HNO_3...

Assertion : Al becomes passive in conc. HNO3\mathrm{HNO}_3. Reason: Conc. HNO3\mathrm{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. HNO3\mathrm{HNO}_3 because concentrated HNO3\mathrm{HNO}_3 is oxidising agent and produces a protective layer of oxide on the surface.
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