The standard reduction potential for Zn\(^{2+}\)/Zn, Ni\(^{2+}\)/Ni and Fe\(^{2+}\)/Fe are -0.76, -0.23 and -0.44 V respectively. The reaction X + Y\(^{2+}\) \( \rightarrow \) X\(^{2+}\) + Y will have more negative \( \Delta G \) value when X and Y are