Question

1.
Why should a magnesium ribbon be cleaned before burning in air?
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Answer 1

Answer:

Your answer is

The magnesium ribbon is rubbed with Sandpaper so that the layer of oxide and carbonate gets reduced and the magnesium ribbon can easily undergo combustion process.

Explanation:

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Answer 2

Answer :

Magnesium is a highly reactive metal. When exposed to air for a long time it gets coated with the layer of oxide which is physically and mentally stable and therefore, partly masks the reactivity of magnesium. The oxide coating does not burn when a flame is brought in contact with the metal. Therefore, the surface should be cleaned, with a sandpaper before burning the magnesium ribbon in air.