Question

magnesium ribbon should be cleaned before burning in air why

Answer 1

Magnesium ribbon is cleaned before burning so that coating of impurity (such as oxide) formed on its surface is removed and it becomes pure magnesium..

Magnesium is a very reactive metal when stored it reacts with oxygen to form a layer of magnesium oxide on its surface this layer of magnesium oxide is quite stable and prevents further reaction of magnesium with oxygen the magnesium ribbon is cleaned by sand paper for removing this layer so that the underlying metal can be exposed to air..

Hope this may help you ..

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Answer 2

Hi

Here is ur answer

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# Magnesium ribbon must be cleaned before burning in air so that the layer of magnesium oxide (which is formed due to reaction of magnesium with air) can be removed in order to get the desired chemical reaction.

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Hope it helps U