Q.
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a
Zn / Zn2+(1M) // Cu2+(1M) / Cu
b
Zn / Zn2+(1M) // Ag+(1M) / Ag
c
Cu / Cu2+(1M) // Ag+(1M) / Ag
d
Zn / Zn2+(1M) // Co2+(1M) / Co
answer is B.
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