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(a) What do you see when a magnesium rib...

(a) What do you see when a magnesium ribbon is burnt ? Is magnesium oxidised or reduced in this reaction ? (b) Define corrosion.

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(a) Magnesium burns with a dazzling light producing white ash of magnesium oxide.
`2Mg + O_2to 2MgO`
Magnesium is oxidised because it combines with oxygen.
(b) Corrosion is defined as the combination of a metal with atmospheric oxygen, carbon dioxide and moisture to form an oxide, carbonate, etc. Corrosion causes damage to car bodies, bridges, etc.
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