Metals like potassium and sodium are stored under oil because they react __________ with the oxygen and moisture in the air.

Galvanisation protects iron from rusting by coating it with zinc. How does this process function if the zinc coating is scratched?

An unknown metal $X$ reacts with dilute hydrochloric acid to produce bubbles of gas, but it does not react with cold water or steam. Where is $X$ most likely located in the reactivity series?

To protect a steel pipeline (made mostly of iron) from corrosion using sacrificial protection, which of the following metals would be UNSUITABLE to use as the sacrificial anode?

True or False: A metal that is difficult to extract from its ore is usually considered to have low reactivity because it is so stable as a compound.