Question

The standard electrode potentials of $Ag ^{+} / Ag$ is $+0.80\, V$ and $Cu ^{+} / Cu$ is $+0.34\, V$. If these electrodes are connected through a salt bridge, which of the following statements is correct?

• A. Silver electrode acts as anode and $E^{\circ}$ cell is $-0.34 V$
• B. Copper electrode acts as anode and $E^{\circ}$ cell is + $0.46 V$
• C. Silver electrode acts as a cathode and $E ^{\circ}$ cell is $-0.34 V$
• D. Copper electrode acts as cathode and $E ^{\circ} cell$ is $+0.46V$

Answer 1

Answer: (B)

Electrode having higher reduction potential has to be cathode.
Hence, silver electrode act as a cathode. Because reduction potential of silver electrode $\left(E^{\circ}\right)$ is $+80 V$. Which is more than given reduction potential of $C u(+34 V)$
Hence, $E_{\text {cell }}{ }^{\circ}$ will determine as:
$E_{\text {cell }}{ }^{\circ}=E_{\text {( Reduction) cathode }}{ }^{\circ}-E_{\text {( Reduction) anode }}{ }^{\circ}$ $=+80-(+0.34)=+0.46 V$