Aluminium surface is often 'Anodized'. This means the deposition of a layer of –

Anodising is a process of forming a thick oxide layer of

To protect steel and iron from rusting, a thin layer of which one of the following metals is applied?

Galvanization is a method of protecting iron from rusting by coating with a thin layer of

Which one of the following is the correct sequence of the given substances in the decreasing order of their densities?

Which one of the following is essential in corrosion of iron metal?