Q32 of 152 Page 46

Give one example of a oxidation -reduction reaction which is also:

(a) a combination reaction


(b) a displacement reaction

(a)

Copper combines with oxygen to form copper oxide and it is also a oxidation-reduction reaction.


(b)


Here hydrogen displaces copper to form dihydrogen oxide(water).



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30 What is a decomposition reaction? Give an example of a decomposition reaction. Describe an activity to illustrate such a reaction by heating. 31 Zinc oxide reacts with carbon, on heating, to form zinc metal and carbon monoxide. Write a balanced chemical equation agent, and

(i) Oxidising agent


(ii) reducing agent, in this reaction.

 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.