Question

Why do we rub magnesium ribbon with a sand-paper before igniting?​

Answer 1

When exposed to air many metals will slowly react with oxygen in the atmosphere to form metal oxides and magnesium is one of those metals. ... Rubbing with sand paper helps to remove this oxide layer due to which burning speeds up.

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Answer 2

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. The ribbons should be sanded with a fine sandpaper, therefore, to remove the layer. Burning speeds up the conversion of magnesium to magnesium oxide in air.

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