Question

10. Why should a magnesium ribbon be cleaned before burning in air
(1)​

Answer 1

Answer:

Magnesium ribbon should be cleaned before burning in air. It is formed due to the slow reaction of moist air on it. These hinders the burning of magnesium. So, this layer is removed by rubbing with sand paper before burning

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Answer 2

Answer:

To remove the chemically inert Magnesium Oxide

Explanation:

2Mg+O2-->2MgO

Thus, whenever Magnesium is kept in contact with air, it will form a layer of Magnesium oxide on itself which is chemically inert and thus does not respond to flame test.

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