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Question

E(SRP) of different half cells are given:-
ECu2+/Cu=0.34 volt;EZn2+/Zn=0.76 volt
EAg+/Ag=0.8 volt;EMg2+/Mg=2.37 volt
Which of the following has the most negative ΔG value?

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

The correct option is B Zn(s)|Zn2+(1M)||Ag+(1M))|Ag(s)
E0cell=E0cathodeE0anode
More postive the value of E0cell, G0 will be more negative.
G0=nFE0cell
For option A, E0cell=1.61
For option B, E0cell=1.56
For option C, E0cell=0.46
For option D, E0cell=1.98

ΔG is the most negative for (B).

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