The standard oxidation potentials of Zn and Ag in water at 25oC are Zn(s)→Zn2++2e [Eo=0.76 V]Ag(s)→Ag++e [Eo=−0.80 V]Which of the following reactions actually takes place?

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Zn(s)+2Ag+(aq)→Zn2++2Ag(s)

Zn2++2Ag+(s)→2Ag+(aq)+Zn(s)

Zn(s)+2Ag(s)→Zn2+(aq)+Ag+(s)

Zn2+(aq)+Ag+(aq)→Zn(s)+Ag(s)

answer is A.

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Detailed Solution

Zn(s)+2Ag+→2Ag+Zn2+Eo=0.76+0.8=1.56 V Electrode with higher oxidation potential is anode Electrode with lower oxidation potential is cathode

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