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Which substance is the white powder formed when a magnesium ribbon burns in air?

Answer and explanation

Correct answer: Magnesium oxide

Magnesium reacts with oxygen in air to form white magnesium oxide. The balanced equation is \(2Mg + O_2 \rightarrow 2MgO\). This is a combination reaction because two reactants form one product. Magnesium chloride would require chlorine, which is not present in this reaction.

Related tags

Chemical ReactionsMagnesium CombustionMagnesium OxideCombination ReactionClass 10 Science

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