Question

Which oxide film is more protective ?
a] porous
b] non porous
c] volatile
d] none of these

Answer 1

Answer:

non porous

mujhe options d bhi lag Raha hai

Answer 2

The correct answer is (b) non-porous.

• On the metal's surface, a non-porous oxidation coating forms.
• Because it is not porous, oxygen ions are only able to interact with meta ions via diffusion (there is no direct penetration route).
• As a result, as the scale thickness increases, the growth rate slows.
• If the scale of thickness is inversely related to the pace of scale expansion.