Why should a magnesium ribbon be cleaned before burning in air?
(N/A) $Magnesium$ is a very reactive metal. When stored,it reacts with oxygen to form a layer of $Magnesium$ $Oxide$ $(MgO)$ on its surface. This layer of $Magnesium$ $Oxide$ is quite stable and prevents further reaction of $Magnesium$ with oxygen. The $Magnesium$ ribbon is cleaned with sandpaper to remove this layer so that the underlying metal can be exposed to air for combustion.
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