2
Q:
A) acetic acid | B) oxalic acid |
C) chromic acid | D) citric acid |
Answer: C) chromic acid
Explanation:
Explanation:
Passivity of iron is due to formation of an extremely thin and impervious film of ferrosoferric oxide on the surface of iron. Chromic acid, being a powerful oxidising agent (like nitric acid ) renders iron passive.