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How will you indicate the evolution of a...

How will you indicate the evolution of a gas and the formation of a precipitate in a chemical equation ?

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(a) Potassium chlorate (KClO_(3)) on heating forms potassium chloride and oxygen. Write a balanced equation for this reaction and indicate the evolution of gas. (b) Rewrite the following information in the form of a balanced chemical equation Magnesium burns in carbon dioxide to from magnesium oxide and carbon.

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