At 298K, the standard electrode potentials of Cu 2+ / Cu, Zn 2+ /Zn, Fe 2+ /Fe and Ag /Ag are 0.34 V, - 0.76 V, - 0.44 V and 0.80 V, respectively.
On the basis of standard electrode potential, predict which of the following reaction cannot occur?
ZnSO 4 (aq) +Cu(s)
FeSO 4 (aq) + Cu(s)
ZnSO 4 (aq) + Fe(s)
2Cu(s) + Ag 2 SO 4 (aq)
Text Solution
Verified by ExpertsNOT AVAILABLE
For a reaction to be spontaneous, 
must be positive.
• For, CuSO 4 (aq) + Zn(s) 
ZnSO 4 (aq) + Cu(s)
= 0.34V-(-0,76V)
= 1,1 V
• For, CuSO 4 (aq) + Fe[s) 
FeSO 4 (aq) + Cu(s)
= 0.80V -(-0.44V)
= 1.24V
• For, FeSO 4 (aq) + Zn(s) 
ZnSO 4 (aq) + Fe(s)
=-0.44V-(-0.76V)
= 0.32 V
• For, 2CuSO 4 (aq) + 2Ag(s) 
2Cu(s) + Ag 2 SO 4 (aq)
= 0.34V -0.80V
= -0.46 V ( 
is negative hence reaction cannot occur.)
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