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Explanation:
It should be cleaned before burning due to the following reasons: Magnesium very reactive element which rapidly reacts with oxygen in the air to form a white layer of magnesium oxide and this layer will not burn.
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Answer:
It is cleaned because a magnesium oxide layer is formed on it due to coming in contact with oxygen in air which is an unreactive in nature
The product formed is magnesium oxide(MgO)
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