Question

why Should magnesium ribbon be cleaned before burning in air?​

Answer 1

Answer:

Here's your answer mate

Explanation:

Magnesium ribbon must be cleaned before burning in air so that the 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 readily reacts with oxygen when kept in open.

Therefore it should be properly cleaned with sand paper before burning in order to remove the layer of magnesium oxide that is formed due to continuous contact of magnesium and oxygen.

This process is necessary in order to get correct desired result in the reaction.