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CBSE Class 10 Science 2016 Term 1 Paper

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Question : 10 of 36
Marks: +1, -0
State which of the following chemical reactions will take place or not, giving suitable reason for each :
(a) Zn(s)+CuSO4(aq)→ZnSO4(aq)+Cu(s)\mathrm{Zn}_{(s)} + \mathrm{CuSO}_{4(aq)} \rightarrow \mathrm{ZnSO}_{4(aq)} + \mathrm{Cu}_{(s)}
(b) Fe(s)+ZnSO4(aq)→FeSO4(aq)+Zn(s)\mathrm{Fe}_{(s)} + \mathrm{ZnSO}_{4(aq)} \rightarrow \mathrm{FeSO}_{4(aq)} + \mathrm{Zn}_{(s)}
(c) Zn(s)+FeSO4(aq)→ZnSO4(aq)+Fe  (s)  \mathrm{Zn}_{(s)} + \mathrm{FeSO}_{4(aq)} \rightarrow \mathrm{ZnSO}_{4(aq)} + \mathrm{Fe}_{\;\text{(s)}\;}
Solution:  
(b) Fe(s)+ZnSO4(aq)→FeSO4(aq)+Zn(s)\mathrm{Fe}_{(s)} + \mathrm{ZnSO}_{4(aq)} \rightarrow \mathrm{FeSO}_{4(aq)} + \mathrm{Zn}_{(s)} is not possible, because Zn\mathrm{Zn} is more reactive than Fe\mathrm{Fe} so it cannot be replaced.
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