Q33 of 152 Page 46

What is the difference between displacement and double displacement reactions ? Write equations for these reactions.

In displacement reaction one element takes place of other element in a compound.

Chemical Equation:


CuSO4 (aq) + Zn (s) ZnSO4 + Cu


In double displacement reaction two compounds react by an exchange of ions to form two new compounds.


Chemical equation:


AgNO3 (aq) + NaCl (aq) AgCl (s)+ NaNO3 (aq)



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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.

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

(a) a combination reaction


(b) a displacement reaction

 33 What do you mean by a precipitation reaction? Explain giving an example. 34 Explain the following in terms of gain or loss of oxygen with one example each:

(i) oxidation (ii) reduction