Question

IN
QUE S T
1. Why should a magnesium ribbon be cleaned before burning in air?​

Answer 1

Answer:

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.

Explanation:

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Answer 2

Answer:

When magnesium ribbon remains exposed to moist air, a white layer of basic magnesium oxide is formed on it's surface. This hinders the burning of magnesium. Hence, this layer is first removed by rubbing with sand paper before burning.

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