d and f BLOCK ELEMENTS

What is the primary reason for the very negative standard electrode potential (E°) for Zn²⁺/Zn?

• The instability of the Zn²⁺ ion
• The low ionization energy of Zinc
• The high hydration energy of Zn
• The high stability associated with the completely filled d¹⁰ configuration of Zn²⁺

Which element's E° value for M²⁺/M is primarily related to the highest negative hydration enthalpy (DhydH°)?

• Ti
• Cr
• Fe
• Ni

What factor is primarily responsible for the high standard electrode potential (E°) value for the M³⁺/M²⁺ couple of Iron (Fe)?

• The instability of the Fe³⁺ ion with a d⁵ configuration
• The instability of the Fe²⁺ ion with a d⁶ configuration
• The stability of the Fe²⁺ ion with a d⁶ configuration
• The extra stability of the Fe³⁺ ion with a d⁵ configuration

Why does Mn²⁺ exhibit a relatively low value for the standard electrode potential (E°) for M³⁺/M²⁺?

• The stability of the Mn³⁺ ion with a d⁴ configuration
• The instability of the Mn²⁺ ion with a d⁵ configuration
• High lattice energy of MnF₃
• The stability of the Mn²⁺ ion with a d⁵ configuration

Which element among the first-row transition metals has the most negative value for the standard electrode potential (E°) for M²⁺/M?

• Ti
• Mn
• Ni
• Zn