Why magnesium when should be rubbed by sandpaper before burning?
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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 ofmagnesium with air) can be removed in order to get the desired chemical reaction.
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because on magnesium ribbon a protective layer of MgO get formed.. which provides hinderence in burning.. so by using sand paper we remove that protective layer..
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