Question

Assertion (A): $HN{O}_3$ makes iron passive.
Reason (R): $HN{O}_3$ forms a protective layer of ferric nitrate on the surface of iron.
Mark the correct choice as:
[1 Mark]

• A. Both A and R are true and R is the correct explanation of A
• B. Both A and R are true but R is NOT the correct explanation of A
• C. A is true but R is false
• D. A is false and R is True

Answer 1

The correct option is C A is true but R is false

$HN{O}_3$ makes iron passive and its passivity is attained by formation of a thin film of oxide on iron. $Fe$ does not dissolve in conc. $HN{O}_3$ solution.