Question

why magnesium ribbon rub before it's burning?​

Answer 1

Answer:

Magnesium ribbon should be cleaned with sandpaper before burning in the air. It should be cleaned before burning due to the following reasons: Magnesium very reactive element which rapidly reacts with oxygen in the air to form a white layer of magnesium oxide and this layer will not burn.

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Answer 2

Answer:

magnesium ribbon oxidised ho jata hai

for example jasay iron ko Jung kha jata hai