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  • Which of the following metal becomes passive in contact w...
Multiple choice

Which of the following metal becomes passive in contact with conc. HNO3?

  1. Gold

  2. Iron

  3. Zinc

  4. Silver

  5. Lead

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Iron becomes passive in contact with high conc.HNO3   (80%) because an oxide coating of iron is formed on the surface.

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