Q.
Which of the following becomes passive on reacting with conc. HNO3 due to the formation of passive oxide film?
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a
Cr
b
Al
c
Be
d
All of these
answer is D.
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Detailed Solution
When dipped in conc. HNO3, many metals like Cr, AI, Be, etc., get coated by a protective oxide layer. The phenomenon is called passivation of metal.
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