Why can burning of magnesium be considered both combination and oxidation?
Answer and explanation
Correct answer: Magnesium combines with oxygen to form magnesium oxide
When magnesium burns, it reacts with oxygen according to 2Mg + O₂ → 2MgO. It is a combination reaction because two reactants form one main product, magnesium oxide. It is also oxidation because magnesium gains oxygen; in electron terms, magnesium loses electrons and its oxidation state rises from 0 to +2. Thus option A gives both required ideas, whereas the other options describe unrelated changes.
Frequently asked questions
What is the correct answer to this question?
Magnesium combines with oxygen to form magnesium oxide
Why is this the correct answer?
When magnesium burns, it reacts with oxygen according to 2Mg + O₂ → 2MgO. It is a combination reaction because two reactants form one main product, magnesium oxide. It is also oxidation because magnesium gains oxygen; in electron terms, magnesium loses electrons and its oxidation state rises from 0 to +2. Thus option A gives both required ideas, whereas the other options describe unrelated changes.
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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