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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