Magnesium ribbon is rubbed before burning because it has a coating of * (a) basic magnesium carbonate (b) basic magnesium oxide (c) basic magnesium sulphide (d) basic magnesium chloride
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b is correct and put some thanks and follow
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Magnesium is a highly reactive metal. When exposed to air it forms a layer of magnesium oxide on its surface, which prevents further reaction of magnesium with oxygen. Magnesium ribbon is rubbed before burning because it has a coating of basic magnesium oxide.
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