When magnesium burns, with which gas does it react to form magnesium oxide?
Answer and explanation
Correct answer: Oxygen
Magnesium burns with a bright white flame because it reacts with oxygen in the air. The balanced equation is 2Mg + O₂ → 2MgO, showing that oxygen combines with magnesium to form magnesium oxide. Nitrogen is abundant in air but is not the reacting gas in this standard combustion example. Chlorine and carbon dioxide are not the intended reactants. Therefore option B is correct.
Frequently asked questions
What is the correct answer to this question?
Oxygen
Why is this the correct answer?
Magnesium burns with a bright white flame because it reacts with oxygen in the air. The balanced equation is 2Mg + O₂ → 2MgO, showing that oxygen combines with magnesium to form magnesium oxide. Nitrogen is abundant in air but is not the reacting gas in this standard combustion example. Chlorine and carbon dioxide are not the intended reactants. Therefore option B is correct.
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.
