. Explain the following in terms of gain or loss of oxygen with two examples each


(a) Oxidation (b) Reduction

 

Best Answer

Answer: (a) Oxidation: A chemical reaction in which gain of oxygen or loss of hydrogen takes place.

Example: (i)

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 Here, magnesium is oxidised to form magnesium oxide

ii.

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Here, copper is oxidised to form copper oxide.

(b) Reduction: A chemical reaction in which loss of oxygen or gain of hydrogen takes place.

Example: (i) When zinc oxide is heated with carbon, then zinc metal and carbon monoxide are formed:

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In this reaction, Zinc oxide (ZnO) is reduced to zinc by the loss of oxygen.

(ii) When copper oxide is heated with hydrogen, then copper metal and water are formed:

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In this reaction, copper oxide is losing oxygen to form copper metal. Therefore, copper oxide is reduced to copper.

 

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