Q34 of 152 Page 46

Explain the following in terms of gain or loss of oxygen with one example each:

(i) oxidation (ii) reduction

(a)

(i) In the above reaction hydrogen gains oxygen and is oxidized forming dihydrogen oxide.


(ii) In the above reaction Copper loses Oxygen And is reduced forming copper metal.



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33 What is the difference between displacement and double displacement reactions ? Write equations for these reactions. 33 What do you mean by a precipitation reaction? Explain giving an example. 34 When copper powder is heated strongly in air, it forms copper oxide. Write a balanced chemical equation for this reaction. Name (i) substance oxidised, and (ii) substance reduced. 35 Define the following in terms of gain or loss of hydrogen with one example each:

(i) oxidation (ii) reduction