Assertion (A) `HNO_(3)` makes iron passive.
Reason (R ) `HNO_(3)` forms a protective layer of ferric nitrate on the surface of iron.

Options

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

C

Explanation

`HNO_(3)` makes iron passive and its passivity is attained by formation of a thin film of oxide on iron.