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Question
You are given samples of three metals - sodium, magnesium and copper. Suggest any two activities to arrange them in order of their decreasing reactivities.
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Solution
Sodium, magnesium and copper can be arranged based on their reactivity with water.
- Sodium reacts violently with cold water because it is the most reactive of the three.
- Magnesium does react with hot water to form magnesium hydroxide and hydrogen gas. It reacts with steam even more vigorously to form magnesium oxide.
- Copper does not react even with steam, and it is the least reactive of the three.
Sodium, magnesium and copper can be arranged based on their reactivity with a dilute acid as well.
- Sodium reacts with dilute hydrochloric acid violently.
- Magnesium reacts with dilute hydrochloric acid but less rapidly than sodium.
- Copper is the least reactive, and it does not react with dilute hydrochloric acid.
So the order of their decreasing reactivity is sodium > magnesium > copper.
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