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Question
Chemistry
Assertion: Al becomes passive in conc. HNO3. Reason: Conc. HNO3 has no action on aluminium metal.
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Q.
Assertion :
Al becomes passive in conc. HNO
3
.
Reason :
Conc. HNO
3
has no action on aluminium metal.
AIIMS
AIIMS 2014
The p-Block Elements
A
If both assertion and reason are true and reason is the correct explanation of assertion
35%
B
If both assertion and reason are true but reason is not the correct explanation of assertion
18%
C
If assertion is true but reason is false
41%
D
If both assertion and reason are false
6%
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.