Question

magnesium ribnon should be rubbed with sand paper why ?​

Answer 1

Answer:

Like rusting in case of iron, with magnesium, the oxide layer forms a white coating on the outside of the metal that will slow down or interfere with the burning process. Rubbing with sand paper helps to remove this oxide layer due to which burning speeds up

Explanation:

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Answer 2

Explanation:

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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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