Explain the following in terms of gain of oxygen with two examples each. (a) Oxidation (b) Reduction

Answer:

Oxidation and reduction reactions are two chemical reactions that often occur together. There is an electron exchange in this reaction. When reduction oxidation reactions occur simultaneously it is called as redox reaction or reduction- oxidation reaction. These reactions are balanced chemical reactions.

Oxidation reaction

On introducing two molecules to each other, one molecule loses an electron. This reaction is called oxidation. Oxidation reactions can be defined in terms of addition of oxygen or the removal of hydrogen.

Examples:

CuO(s) + H2(g) → Cu(s) + H2O(l)

CuO adds oxygen to H2, CuO is therefore the oxidizing agent or oxidant, it oxidizes the H2 to H2O.

Reduction reaction

On introducing two molecules to each other, one molecule gains an electron. This reaction is called reduction. Reduction involves a half-reaction in which a chemical species decreases its oxidation number, done usually by gaining electrons.

Example:

CuO(s) + H2(g) → Cu(s) + H2O(l)

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