Which of the following reactions is not correct: (a) Zn+CuSO4-ZnSO4+Cu (b) 2Ag+Cu(NO3)2-2AgNO3+Cu (c) Fe+CuSO4-FeSO4+Cu (d) Mg+2HCl-MgCl2+H2
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b is wrong since Ag cannot displace Cu (Cu has higher reduction potential in electrochemical series)
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