Chemistry - Complete d-block Question with Solution | TestHub

The standard reduction potential of metals indicates their tendency to get reduced.

Cu²⁺/Cu has a positive value of $E^{\circ }$ ($+0.34V$), so it is not included.

Zn²⁺/Zn, Fe²⁺/Fe, and Ni²⁺/Ni have negative values of $E^{\circ }$, showing that these metals are easily oxidized.

Therefore, the metals having negative $E_{M^{2+}/M}^{\circ }$ are Zn, Fe, and Ni.

Correct Answer: (B), (C) and (D)