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A ইউনিট : 2010-2011 || 2010

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Zn(s) + Cd2+(aq) Zn2+(aq) +Cd(s) E° cd2+/cd =-0.404 V   E° Zn2+/Zn=-0.763 V 
Cu(s) + ZnSO4 (aq)CuSO4(aq) + Zn(s) E°Cu2+/Cu=0.34V  E°Zn2+/zn =-0.76 V
2Ag(s) +2H+(aq) 2Ag+(aq) +H(g)E°Ag+/Ag=0.80V
3Sn2+ (aq) + 2Fe(s) 3Fe2+ (aq) +3Sn(s) E°Fe3+/Fe =-0.036 V    E° Sn2+ /sn =-0.140 V