Question

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

Answer 1

Explanation:

magnesium ribbon should be cleaned with Sandpaper before burning in the air to remove the magnesium oxide layer from the Ribbon which may prevent or slow down the burning of magnesium ribbon and impurities deposited on magnesium ribbon can be removed and only pure magnesium can be used for the reaction

Answer 2

Question:

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

Answer:

We should clean a megnesium ribbon befor burning in air to remove the Magnesium oxide layer from the ribbon which may prevent or slow down the burning of magnesium ribbon. Unwanted impurities deposited on the magnesium ribbon can be removed and only pure magnesium can be used for the reaction.

Hope it helps