Explain why?(i) Reaction FeSO4(aq) + Cu(s) → CuSO4(aq) + Fe(s) does

1.	Explain why?(i) Reaction FeSO4(aq) + Cu(s) → CuSO4(aq) + Fe(s) does not occur. (ii) Zinc can displace copper from aqueous CuSO4 solution but Ag cannot. (iii) Solution of AgNO3 turns blue when copper rod is immersed in it.
Answer» (i) E^ΘFe²⁺_/Fe = – 0.44 V E^ΘCu²⁺_/Cu = +0.34 V \(\because\) As we know that a metal having more negative value of E^Θ can displace the metal having less negative or positive value of E^Θ from their salt solution. So, Fe can displace Cu from CuSO₄solution. But, in the reaction, it is showing that Cu displaces Fe from FeSO₄ solution which is not feasible. So, the given reaction does not occur. (ii) E^ΘZn²⁺_/zn= – 0.76 V E^ΘCu²⁺_/Cu = + 0.34 V E^Θ_Ag+Ag= + 0.80 V Similarly, Zn has negative E^Θ and Cu has positive E^Θ . Zinc can displace copper from aqueous CuSO₄solution. But silver has highest +ve value of E^Θ . Than Cu, so, Ag cannot displace Cu from CuSO₄ solution. (iii) Since, Cu has lesser E^Θ than Ag. So, copper can displace Ag from AgNO₃ solution due to which the solution turns blue.

Explain why?(i) Reaction FeSO4(aq) + Cu(s) → CuSO4(aq) + Fe(s) does not occur. (ii) Zinc can displace copper from aqueous CuSO4 solution but Ag cannot. (iii) Solution of AgNO3 turns blue when copper rod is immersed in it.

Answer»

(i) E^ΘFe²⁺_/Fe = – 0.44 V

E^ΘCu²⁺_/Cu = +0.34 V

\(\because\) As we know that a metal having more negative value of E^Θ can displace the metal having less negative or positive value of E^Θ from their salt solution. So, Fe can displace Cu from CuSO₄solution.

But, in the reaction, it is showing that Cu displaces Fe from FeSO₄ solution which is not feasible. So, the given reaction does not occur.

(ii) E^ΘZn²⁺_/zn= – 0.76 V

E^ΘCu²⁺_/Cu = + 0.34 V

E^Θ_Ag+Ag= + 0.80 V

Similarly, Zn has negative E^Θ and Cu has positive E^Θ . Zinc can displace copper from aqueous CuSO₄solution. But silver has highest +ve value of E^Θ . Than Cu, so, Ag cannot displace Cu from CuSO₄ solution.

(iii) Since, Cu has lesser E^Θ than Ag. So, copper can displace Ag from AgNO₃ solution due to which the solution turns blue.

Explain why?(i) Reaction FeSO4(aq) + Cu(s) → CuSO4(aq) + Fe(s) does not occur. (ii) Zinc can displace copper from aqueous CuSO4 solution but Ag cannot. (iii) Solution of AgNO3 turns blue when copper rod is immersed in it.

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