Question

why should magnesium ribbon be cleaned before burning in air

Answer 1

The magnesium ribbon which we use usually has a coating of white layer of magnesium oxide on it's surface.It is formed by the slow reaction of moist Air on it .This hinders the burning of magnesium.So, this layer is removed by rubbing with sandpaper before burning.


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Answer 2

Ur answer mate :-

It is cleaned before burning in air to remove protective layer of magnesium carbonate because magnesium carbonate on burning produce CO2 which causes combustion.

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