Which of the following is a chemical change but not a precipitation reaction?
Answer and explanation
Correct answer: Burning magnesium ribbon in air to form magnesium oxide
Magnesium reacts with oxygen in air to form magnesium oxide: \(2Mg + O_2 \rightarrow 2MgO\). Since a new substance is formed, this is a chemical change. However, it does not involve mixing aqueous solutions to produce an insoluble solid, so it is not a precipitation reaction. In contrast, option A forms insoluble \(BaSO_4\), option B forms insoluble \(AgCl\), and option D forms insoluble \(PbI_2\); therefore, these are precipitation reactions.
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What is the correct answer to this question?
Burning magnesium ribbon in air to form magnesium oxide
Why is this the correct answer?
Magnesium reacts with oxygen in air to form magnesium oxide: \(2Mg + O_2 \rightarrow 2MgO\). Since a new substance is formed, this is a chemical change. However, it does not involve mixing aqueous solutions to produce an insoluble solid, so it is not a precipitation reaction. In contrast, option A forms insoluble \(BaSO_4\), option B forms insoluble \(AgCl\), and option D forms insoluble \(PbI_2\); therefore, these are precipitation reactions.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Chemical Reactions and Equations.
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