Question

when a magnesium ribbon burns with a dazzling flame in air and changes into a white substance, MgO. Is magnesium being oxidised or reduced in this reaction

Answer 1

If we will remove the oxidation number of 2Mg Its zero(alone elements have 0 oxidation number, according to the rule)
Similarly for 02.
the compound formed is 2Mg0
here oxidation number of Mg is +2
and the oxidation number of 02 is -2
When there is rise in oxidation number the given element is oxidized
Hence as the oxidation number of Mg has changed from 0 to +2 it's oxidized.
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Answer 2

MgO is oxidised because oxidation means addition of oxygen and reduction of hydrogen.. and before reaction oxidation no. of magnesium is 0 (zero) and after reaction oxidation no. of magnesium is +2......addition of oxidation no. is also oxidised... so MgO is oxidised in nature............
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