NTSE Stage 2 SAT 2016 Question Paper

Question : 19 of 100

Marks: +1, -0

Magnesium ribbon is rubbed with sand paper before making it to burn. The reason of rubbing the ribbon is to :

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 sand paper (silicon dioxide) with magnesium for lowering ignition temperature of the ribbon.

Solution:

Magnesium gets corrode with the layer of oxide.
In order to remove the layer of oxide, it is rubbed with sand paper

2\Mg+\O_2{––––––––▸}↖{∆ \Heating}2\MgO

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