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Class 10ScienceChemical Substances – Nature and BehaviourChemical Reactions and EquationsMedium
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Cleaning magnesium ribbon before burning removes which obstacle?

Answer and explanation

Correct answer: Surface oxide layer

Magnesium reacts with oxygen in air to form a thin, stable layer of magnesium oxide on its surface. This coating prevents fresh magnesium from contacting oxygen easily and can delay or weaken ignition. Rubbing the ribbon with sandpaper removes the oxide layer, exposing clean magnesium so the combustion reaction starts clearly. Oxygen is still needed and remains present; liquid magnesium and white powder are not the obstacle being removed.

Related tags

ScienceClass10Chemical-ReactionsMagnesium-RibbonOxide-LayerChemical Reactions And EquationsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour
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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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