You are given samples of three metals- sodium, magnesium and copper. Suggest any two activities to arrange them in order of their decreasing reactivities.

Academic Chemistry NCERT Class 10

(i) When sodium, magnesium, and copper are left in the air, sodium reacts vigorously with oxygen to form sodium oxide, magnesium reacts with oxygen to form magnesium oxide only on heating, whereas copper does not burn in the air even on string heating. It reacts only on prolonged heating.

(ii) Sodium reacts vigorously with cold water to form sodium hydroxide and hydrogen, magnesium does not react cold water but reacts with hot water to form magnesium hydroxide and hydrogen but copper does not react even with steam.

This shows that sodium is most reactive, then magnesium and copper is the least reactive among the three i.e.Sodium> magnesium> copper

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Updated on: 10-Oct-2022

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