Because magnesium ribbon has a layer of magnesium carbonate
It should be cleaned to remove the oxide layer formed on it\’s surface
Magnesium ribbon should be cleaned with sandpaper before burning in the air because of the following reasons:\tMagnesium 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.\tTo remove the\xa0Magnesium oxide layer from the ribbon which may prevent or slow down the burning of\tmagnesium ribbon.\tUnwanted impurities deposited on the magnesium ribbon can be removed and only pure magnesium can be used for the reaction.
It should be cleaned before burning so that the magnesium oxide formed is free of dust

Because when mgreact with o2then it make inert protective layer of mgo.so mg ribbon cleaned before burning.
This done because mg react with atmospheric oxygen and form mgo2 so that it is clean before burning
It is so because magnesium reacts with oxygen present in air to form a layer of basic magnesium carbonate MgOH.MgCO³

Because it react with oxygen to form a layer of magnesium oxide that\’s why it cleaned before burnig in air
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What is peptic ucler????
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Because the layer of dust are situated on the magnesium ribbon
Because to clean the layer of MgO from ribbon so that it can burn easily
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To remove layer of oxide
to remove the layer of magnesium oxide

To remove protective layer so it can react easily????
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To remove the coating of magnesium oxide