Question

Match the following elements with their reactivity based on reaction with cold water.

• A. Highly reactive
• B. Moderately reactive
• C. Less reactive
• D. Inert

Answer 1

Potassium reacts vigorously with cold water, so it is highly reactive.

Magnesium reacts with hot water but not with cold water. That means it requires some energy to react, so it is moderately reactive.

Aluminium does not react with hot water nor cold water. It reacts only with steam that means it needs more energy. So, it is less reactive.

Gold does not react even with steam, it is considered as an inert metal.