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

b > c > a

b

b > a > c

c

a > b > c

d

c > a > b

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.

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