Question

The electrode potential of M²⁺/M of 3d-series elements shows the positive value for ______.

Options

• Zn

• Co

• Fe

• Cu

Answer 1

The electrode potential of M²⁺/M of 3d-series elements shows the positive value for Cu.

Explanation:

In the 3d-series, only Cu shows a positive value of electrode potential of M^2+/M.

Zn²⁺/Zn = − 0.76 V,

Co²⁺/Co = − 0.28 V,

Fe²⁺/Fe = − 0.44 V,

Cu²⁺/Cu = + 0.34 V