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Class 10ScienceChemical Substances – Nature and BehaviourChemical Reactions and EquationsEasy
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Which substance is formed when magnesium ribbon is burnt in air?

Answer and explanation

Correct answer: Magnesium oxide

The governing concept is a combination and combustion reaction involving oxygen. Magnesium burns with a dazzling white flame and combines with oxygen in air to form white magnesium oxide. The balanced equation is 2Mg + O₂ → 2MgO, so option A is correct. Magnesium chloride would require chlorine, magnesium sulphate would require sulphate ions, and magnesium carbonate is not the direct product of burning magnesium in air.

Related tags

Class 10 ScienceMagnesium OxideCombustionCombination ReactionChemical Reactions And EquationsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience
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10 more MCQs
  1. 1What is the process called when one or more substances form new substances with different properties?
  2. 2Which of the following observations can be a common sign that a chemical reaction has occurred?
  3. 3What are the substances written on the left side of the arrow in a chemical equation called?
  4. 4What are the substances written on the right side of the arrow in a chemical equation called?
  5. 5Balancing a chemical equation is based on which law?
  6. 6What must be the same on the reactant and product sides of a balanced chemical equation?
  7. 7When two or more reactants combine to form a single product, what type of reaction is it?
  8. 8Calcium oxide reacts with water to form calcium hydroxide. What type of reaction is this?
  9. 9When a compound breaks down into two or more simpler substances, what type of reaction is it?
  10. 10When calcium carbonate is heated, it forms calcium oxide and carbon dioxide. What type of reaction is this?
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