Q.The standard reduction potentials of $Zn^{2+}/Zn$ , $Cu^{2+}/Cu$ and $Ag^+/Ag$ are $-0.76 \text{ V}$ , $+0.34 \text{ V}$ and $+0.80 \text{ V}$ . Which of the following reactions is NOT spontaneous?

Zn + Cu^{2+} \rightarrow Zn^{2+} + Cu

Cu + 2Ag^+ \rightarrow Cu^{2+} + 2Ag

Ag + Cu^{2+} \rightarrow Ag^+ + Cu

Zn + 2Ag^+ \rightarrow Zn^{2+} + 2Ag

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Q.The standard reduction potentials of Zn2+/ZnZn^{2+}/ZnZn2+/Zn, Cu2+/CuCu^{2+}/CuCu2+/Cu and Ag+/AgAg^+/AgAg+/Ag are −0.76 V-0.76 \text{ V}−0.76 V, +0.34 V+0.34 \text{ V}+0.34 V and +0.80 V+0.80 \text{ V}+0.80 V. Which of the following reactions is NOT spontaneous?