Question

The order of negative standard potential values of $\text{Li}, \text{Na}, \text{K}$ is

• A. $\text{Li}>\text{Na}>\text{K}$
• B. $\text{K}>\text{Na}>\text{Li}$
• C. $\text{Na}>\text{K}>\text{Li}$
• D. $\text{Li}>\text{K}>\text{Na}$

Hint:

For alkali metals, the standard reduction potential does not follow the simple trend of ionization energy. The unusually high (most negative) potential of Li is due to the small size and high charge density of the $\text{Li}^+$ ion, which leads to a massive, highly stabilizing (negative) hydration enthalpy.

Answer 1

The Correct Option is D