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Which of the following reactions not occur? 

A. 2AgNO3(aq) + Zn(s) → Zn(NO3)2(aq)+ 2Ag(s) 

B. CuSO4(aq)+ Zn(s) → ZnSO4(aq)+ Cu(s) 

C. 2AgNO3(aq)+Fe(s) → Fe(NO3)2(aq) + 2Ag(s) 

D. CuSO4(aq) + 2Ag(s) → Cu(s)+ Ag2SO4 (aq)

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Among all the reactions, the reaction d is only not possible because silver is less reactive as compared to copper and hence it cannot displace copper from its salt. 

So correct answer is d.

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