Explain why magnesium ribbon appears dull grey, but becomes silvery when rubbed with sandpaper? (In my book it's worth 2 marks)
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Answer:
Magnesium ribbon is rubbed with the sandpaper before burning is to remove all the impurities which will alter and disturb the reaction with oxygen while burning. Magnesium react with oxygen to form magnesium oxide, which does not burn.
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2
Answer:
Magnesium reacts with the atmospheric oxygen to form a layer of magnesium oxide due to which it loses its shiny surface.
After rubbing with the sand paper, the oxide layer gets washed away and magnesium gets back its shiny surface and turns silver.
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