Which metals do not corrode easily?

Which of the following methods is suitable for preventing an iron frying pan from rusting?

Why do we apply paint on iron articles?

What is iron coated with a layer of zinc called?

What type of coating is formed on copper articles when they get corroded?

$A$ metal $X$ acquires a green colour coating on its surface on exposure to air.
$(i)$ Identify the metal $X$ and name the process responsible for this change.
$(ii)$ Name and write the chemical formula of the green coating formed on the metal.
$(iii)$ List two important methods to prevent this process.