Question

why should a magnesiun ribbon be cleaned before burning in air . if anyone knows then plz answer​

Answer 1

: 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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Answer 2

Answer:

because mg is reactive and layer of magnesium oxide tends to form on it . to remove that layer and extract pure mg . we rub it with sandpaper