At 298 K the standard electrode potentials of and 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? [2022]

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Q.
At 298 K 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 [2022]

1 $C u S O_{4 (a q)} + Z n_{(s)} ⟶ Z n S O_{4 (a q)} + C u_{(s)}$

2 $C u S O_{4 (a q)} + F e_{(s)} ⟶ F e S O_{4 (a q)} + C u_{(s)}$

3 $F e S O_{4 (a q)} + Z n_{(s)} ⟶ Z n S O_{4 (a q)} + F e_{(s)}$

4 $2 C u S O_{4 (a q)} + 2 A g_{(s)} ⟶ 2 C u_{(s)} + A g_{2} S O_{4 (a q)}$

Ans.
(4)

The values of standard reduction potential of Cu and Ag suggest that Cu would undergo oxidation (lower reduction potential) and Ag would undergo reduction (higher reduction potential). Hence, the cell reaction will be $Cu + 2 {Ag}^{+} ⟶ {Cu}^{2 +} + 2 Ag$

Solution

Q.
At 298 K 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 [2022]

1 $C u S O_{4 (a q)} + Z n_{(s)} ⟶ Z n S O_{4 (a q)} + C u_{(s)}$

2 $C u S O_{4 (a q)} + F e_{(s)} ⟶ F e S O_{4 (a q)} + C u_{(s)}$

3 $F e S O_{4 (a q)} + Z n_{(s)} ⟶ Z n S O_{4 (a q)} + F e_{(s)}$

4 $2 C u S O_{4 (a q)} + 2 A g_{(s)} ⟶ 2 C u_{(s)} + A g_{2} S O_{4 (a q)}$

Ans.
(4)

The values of standard reduction potential of Cu and Ag suggest that Cu would undergo oxidation (lower reduction potential) and Ag would undergo reduction (higher reduction potential). Hence, the cell reaction will be $Cu + 2 {Ag}^{+} ⟶ {Cu}^{2 +} + 2 Ag$

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Solution

Q. At 298 K the standard electrode potentials of Cu2+/Cu,Zn2+/Zn,Fe2+/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 [2022]

1 CuSO4(aq)+Zn(s)⟶ ZnSO4(aq)+Cu(s)

2 CuSO4(aq)+Fe(s)⟶ FeSO4(aq)+Cu(s)

3 FeSO4(aq)+Zn(s)⟶ ZnSO4(aq)+Fe(s)

4 2CuSO4(aq)+2Ag(s)⟶ 2Cu(s)+Ag2SO4(aq)

Ans. (4) The values of standard reduction potential of Cu and Ag suggest that Cu would undergo oxidation (lower reduction potential) and Ag would undergo reduction (higher reduction potential). Hence, the cell reaction will be Cu+2Ag+⟶Cu2++2Ag

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Q.
At 298 K 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 [2022]

1 $C u S O_{4 (a q)} + Z n_{(s)} ⟶ Z n S O_{4 (a q)} + C u_{(s)}$

2 $C u S O_{4 (a q)} + F e_{(s)} ⟶ F e S O_{4 (a q)} + C u_{(s)}$

3 $F e S O_{4 (a q)} + Z n_{(s)} ⟶ Z n S O_{4 (a q)} + F e_{(s)}$

4 $2 C u S O_{4 (a q)} + 2 A g_{(s)} ⟶ 2 C u_{(s)} + A g_{2} S O_{4 (a q)}$

Ans.
(4)

The values of standard reduction potential of Cu and Ag suggest that Cu would undergo oxidation (lower reduction potential) and Ag would undergo reduction (higher reduction potential). Hence, the cell reaction will be $Cu + 2 {Ag}^{+} ⟶ {Cu}^{2 +} + 2 Ag$