Chemistry · D and f Block Elements

Pure metals are not easily corroded, even iron hardly gets corroded if pure. The impurities present in the metal promote corrosion.

This option is incorrect because metals that corrode slowly would still undergo corrosion over time, although at a slower rate. Therefore, it is not accurate to say that pure metals corrode slowly.

This option is correct because pure metals, in their elemental form, have a high corrosion resistance. They are chemically stable and are less prone to react with their surroundings, which helps them resist the process of corrosion. 

This option is incorrect because pure metals, by definition, are highly resistant to corrosion. They have a high degree of chemical stability and are less likely to react with their environment. Therefore, it is not accurate to say that pure metals corrode rapidly.

This option is incorrect because pure metals can corrode under certain conditions, although they are generally more resistant to corrosion compared to alloys or impure metals. While corrosion may occur at a slower rate, it is not accurate to say that pure metals are entirely immune to corrosion.