Question

the metal that forms and unstable oxide films on its surface is​

Answer 1

Answer:

Metals like Al, Cr, Cu, Pb, Sn etc formstable oxide film.

Answer 2

The metal that forms unstable oxide films on its surface are given below:

• When the electrons of certain metals react with ambient oxygen, an oxide coating forms on their surface.
• The same mechanism creates an unstable oxide layer, whereas certain noble metals create a temporary oxygen layer.
• This layer can revert to its previous metal condition.
• Metals that are less reactive, such as Gold, Platinum, Silver, and others, create an unstable oxide layer.