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.
Frequently asked questions
What is the correct answer to this question?
Magnesium oxide
Why is this the correct answer?
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.
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.
