Q.

The emf of the following three galvanic cells are represented by E1, E2 and E3 respectively. Which of the following is correct ?(i) Zn/Zn2+(1M)//Cu2+(1M)/Cu(ii) Zn/Zn2+(0.1M)//Cu2+(1M)/Cu(iii) Zn/Zn2+(1M)//Cu2+(0.1M)/Cu

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a

E1 > E2 > E3

b

E3 > E2 > E1

c

E3 > E1 > E2

d

E2 > E1 > E3

answer is D.

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Detailed Solution

According NernstequationWhen cell contains both metal electrodes;  ;     in cell  II SOP is increasing and in cell III SRP is decreasing. order is E2 > E1 > E3
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The emf of the following three galvanic cells are represented by E1, E2 and E3 respectively. Which of the following is correct ?(i) Zn/Zn2+(1M)//Cu2+(1M)/Cu(ii) Zn/Zn2+(0.1M)//Cu2+(1M)/Cu(iii) Zn/Zn2+(1M)//Cu2+(0.1M)/Cu