Standard electrode potentials for a few half cells are mentioned below : º Cu / Cu2 E = 0.34 V, º Zn / Zn2 E = –0.76 V º Ag / Ag E = 0.80 V, º Mg / Mg2 E = –2.37 V Which one of the following cells giv

Question

Standard electrode potentials for a few half cells are mentioned below : º Cu / Cu2 E = 0.34 V, º Zn / Zn2 E = –0.76 V º Ag / Ag E = 0.80 V, º Mg / Mg2 E = –2.37 V Which one of the following cells gives the most negative value of Gº ?

(A) Zn|Zn2+ (1 M)||Mg2+ (1M)|Mg
(B) Zn|Zn2+ (1 M)||Ag+ (1M)|Ag
(C) Ag|Ag+ (1 M)||Mg2+ (1M)|Mg
(D) Cu|Cu2+ (1 M)||Ag+ (1M)|Ag

Prashant Kotian · Accepted Answer

Correct answer: B.  G° = – nF cell E  In all reaction n = 2 is same, so when cell E is more +ve then G° is more –ve For a cell to be spontaneous cell E should be +ve. cell E =  Ag / Ag E –  Zn / Zn2 E = 0.80 – (–0.76) = 1.56 V (2)

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