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Question
When a magnesium ribbon burns in air with a dazzling flame and forms a white ash, is magnesium oxidised or reduced? Why?
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Solution
Magnesium is oxidised when oxygen is added to it, forming magnesium oxide.
\[\ce{\underset{Copper oxide}{CuO} + \underset{Hydrogen}{H2} ->[Heat] \underset{Copper}{Cu} + \underset{Water}{H2O}}\]
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