Question
What is meant by oxidation and reduction reactions? Explain it by giving examples.
✓
Answer
- Chemical reaction in which a substance (atom or molecule) gains oxygen or losses hydrogen is called an oxidation reaction.
- For example,
- $\mathrm{C}+\mathrm{O}_2 \rightarrow \mathrm{CO}_2$
- $2 \mathrm{Mg}+\mathrm{O}_2 \rightarrow 2 \mathrm{Mgo}$
- $2 \mathrm{Cu}+\mathrm{O}_2 \rightarrow 2 \mathrm{Cuo}$
- In above reactions, $C, Mg$ and $Cu$ gain oxygen, and undergo oxidation reactions.
- Chemical reaction in which a substance (atom or molecule) loses oxygen or gains hydrogen is called reduction reaction.
- For example :
- $\mathrm{CuO}+\mathrm{H}_2 \rightarrow \mathrm{Cu}+\mathrm{H}_2 \mathrm{O}$
- $\mathrm{CO}_2+\mathrm{H}_2 \rightarrow \mathrm{CO}+\mathrm{H}_2 \mathrm{O}$
- $\mathrm{MgO}+\mathrm{H}_2 \rightarrow \mathrm{Mg}+\mathrm{H}_2 \mathrm{O}$
- In above reactions, $\mathrm{CuO}, \mathrm{CO}_2$ and $MgO$ lose oxygen. Hence, these are reduction reactions.
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