Question

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2
Why should a
magnesium ribbon be cleaned before burning in air?​

Answer 1

Answer:

magnesium ribbon is cleaned before burning in air because a coating of magnesium carbonate is formed on magnesium it is a mixture of magnesium hydroxide and magnesium carbonate

Answer 2

Answer:

Magnesium is an active metal, means it is reactive even in moist air. So it displaces H from H2O and forms an oxide coating (MgO).

But for it to burn in air we need to remove the coating as it makes the ribbon reactive. Hence it is cleaned.

We can also strongly heat it to remove coating