Question

Why should Magnesium ribbon be cleaned before burning in air ?

Answer 1

Explanation:

Magnesium ribbon must be cleaned before burning in air so that the layer of magnesium oxide (which is formed due to reaction of magnesium with air) can be removed in order to get the desired chemical reaction.

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Answer 2

Magnesium has high affinity towards oxygen. So, the Mg strips develops a coating of Magnesium Oxide (MgO).

2Mg + O2 ----> 2MgO

Thus it must be rubbed with sand paper before burning in air

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