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Q.

The standard reduction potentials of Zn2+ | Zn, Cu2+|Cu and Ag+ |Ag are respectively – 0.76, 0.34 and 0.8V. The following cells were constructed        

    a) Zn / Zn2+ // Cu2+ / Cu        
    b) Zn / Zn2+ // Ag+ / Ag        
    c) Cu / Cu2+ // Ag+ / Ag
    What is the correct order of E0cell of these cells ?

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a

c > a > b

b

a > b > c    

c

b > a > c

d

b > c > a

answer is B.

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Detailed Solution

Higher the difference between SRP of cathode and SRP of anode higher is the cell EMF.

Cell Cathode Anode EMF cell = Ec - Ea
Zn / Zn2+ // Cu2+ / Cu Cu Zn = 0.34+0.76  =1.1V
Zn / Zn2+ // Ag+ / Ag   Ag Zn = 0.8+0.76    =1.56V
Cu / Cu2+ // Ag+ / Ag Ag Cu = 0.8-0.34     =0.46V

 

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