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Question: Answered & Verified by Expert
Assertion: $\mathrm{HNO}_3$ makes iron passive
Reason: $\mathrm{HNO}_3$ forms a protective layer of ferric nitrate on the surface of iron.
Chemistryp Block Elements (Group 15, 16, 17 & 18)
Options:
  • A
    If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
  • B
    If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
  • C
    If the Assertion is correct but Reason is incorrect.
  • D
    If the Assertion is incorrect but the Reason is correct.
Solution:
2468 Upvotes Verified Answer
The correct answer is:
If the Assertion is correct but Reason is incorrect.
$\mathrm{HNO}_2$ makes iron passive due to formation of passive form of oxide on the surface. Hence, Fe does not dissolve in conc $\mathrm{HNO}_3$ solution.

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