Question detail
In the reaction 2Mg + O2 → 2MgO, what is the oxidation state change for magnesium?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Oxidation, reduction and redox equations
Question
- A. 0 to +2
- B. +2 to 0
- C. 0 to -2
- D. -2 to 0
Answer
0 to +2
Explanation
Magnesium changes from an oxidation state of 0 in elemental form to +2 in MgO, indicating oxidation.
Common mistake
Misunderstanding Reduction
Students often confuse reduction with an increase in oxidation state instead of a decrease.
Reduction is defined as a decrease in oxidation state. To clarify, remember that when an element gains electrons, its oxidation state decreases. For example, in the reaction where Fe^3+ gains an electron to become Fe^2+, the oxidation state decreases from +3 to +2, confirming that reduction has occurred.
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