The standard reduction potentials of {\Zn} and {\Ag} in water at 298 {\K} are, {\Zn}^{2+}+2 e^{-} \to {\Zn}, E^{\circ}=-0.76 {\V} \text{ and } {\Ag}^{+}+e^{-} ⟷ {\Ag} ; E^{\circ}=+0.80 {\V} \text{. } Which of the following reactions take place?

Correct Answer is : Zn(s)+2Ag+(aq)→Zn2+(aq)+2Ag(s)

{\Zn}^{2+}(a q)+2 {\Ag}(s) \to 2 {\Ag}^{+}(a q)+ {\Zn}(s)

{\Zn}(s)+2 {\Ag}^{+}(a q) \to {\Zn}^{2+}(a q)+2 {\Ag}(s)

{\Zn}^{2+}(a q)+ {\Ag}^{+}(a q) \to {\Zn}(s)+ {\Ag}(s)

{\Zn}(s)+ {\Ag}(s) \to {\Zn}^{2+}(a q)+ {\Ag}^{+}(a q)

COMEDK Exam 2013 Solved Paper

Question : 92 of 180

Marks: +1, -0

The standard reduction potentials of Zn and Ag in water at 298K are,
‌Zn2++2e−→Zn,‌‌E∘=−0.76V
‌‌ and ‌Ag++e−⟷Ag;‌‌E∘=+0.80V‌. ‌
‌
Which of the following reactions take place?

Zn2+(aq)+2‌Ag(s)→2Ag+(aq)+Zn(s)
Zn(s)+2Ag+(aq)→Zn2+(aq)+2‌Ag(s)
Zn2+(aq)+Ag+(aq)→Zn(s)+Ag(s)
Zn(s)+Ag(s)→Zn2+(aq)+Ag+(aq)

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