Question

The values of standard oxidation potentials of following reactions are given below :
(i) $Zn⟶Z{n}^{2+}+2e^{-};E^{\circ }=0.762V$
(ii) $Fe⟶F{e}^{2+}+2e^{-};E^{\circ }=0.440V$
(iii) $Cu⟶C{u}^{2+}+2e^{-};E^{\circ }=-0.345V$
(iv) $Ag⟶A{g}^{+}+e^{-};E^{\circ }=-0.800V$
Which of the following is most easily reduced?

• A. Fe
• B. Ag
• C. Zn
• D. Cu

Answer 1

Answer: (B)

Lower the axidation potential of the element easier will be its reduction. Compare the axidation potential of elements and find the answer.
$\because$ Ag has lowest oxidation potential among given choices.
$\therefore Ag$ is reduced most easily.