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A student burnt a magnesium ribbon in air and obtained a white powder. Which is the correct conclusion about the powder and the reaction?

Answer and explanation

Correct answer: Magnesium oxide and combination reaction

Magnesium burns in oxygen present in air to form white magnesium oxide: \(2\mathrm{Mg}+\mathrm{O}_2\rightarrow2\mathrm{MgO}\). Since two reactants combine to form one product, this is a combination reaction. In contrast, a decomposition reaction involves one compound breaking down into two or more substances.

Related tags

ScienceClass10Chemical ReactionsMagnesiumCombination ReactionChemical Equations

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