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0. Magnesium ribbon is rubbed with sand paper before making it to burn. The reason of rubbing the ribbon is to (NTSE Stage-II, 2015-16)
Remove moisture condensed over the surface of ribbon
Generate heat due to exothermic reaction
Remove magnesium oxide formed over the surface of magnesium
Mix silicon from and (silicon dioxide with magnesium for lowering ignition temperature of the ribbon
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