Question

Why should a magnesium ribbon be
cleaned before burning in



air?

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Answer 1

MAGNESIUM RIBBON SHOULD BE CLEANED BEFORE BURNING IN AIR,BECAUSE it has an oxide layer over it's surface

Answer 2

Magnisium ribbon is very reactive and reacts with O2 present in air to produce MgO which is a protective layer and thus creates a barrier between Mg with the direct contact with air.

thus this layer has to be put off by rubbing with a sandpaper