Question
What is meant by oxidation and reduction reactions? Explain it by giving examples.
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Answer
Chemical reaction in which a substance (atom or molecule) gains oxygen or loses hydrogen is called an oxidation reaction.
$\begin{aligned}\text {For example, }\quad & C + O _2 \longrightarrow CO _2 \\ & 2 Mg + O _2 \longrightarrow 2 MgO \\ & 2 Cu + O _2 \longrightarrow 2 CuO \end{aligned}$
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.
$\begin{aligned}\text {For example, }\quad & CuO + H_2 \longrightarrow Cu + H_{2}O \\ & CO_2 + H _2 \longrightarrow CO + H_{2}O \\ & MgO + H _2 \longrightarrow Mg + H_{2}O \end{aligned}$
In above reactions, $CuO , CO _2$ and MgO lose oxygen. Hence, these are reduction reactions.
$\begin{aligned}\text {For example, }\quad & C + O _2 \longrightarrow CO _2 \\ & 2 Mg + O _2 \longrightarrow 2 MgO \\ & 2 Cu + O _2 \longrightarrow 2 CuO \end{aligned}$
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.
$\begin{aligned}\text {For example, }\quad & CuO + H_2 \longrightarrow Cu + H_{2}O \\ & CO_2 + H _2 \longrightarrow CO + H_{2}O \\ & MgO + H _2 \longrightarrow Mg + H_{2}O \end{aligned}$
In above reactions, $CuO , CO _2$ and MgO lose oxygen. Hence, these are reduction reactions.
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