Question

Consider the following standard electrode potentials ( $\text{E}^{\text{o}}$ in volts) in aqueous solution:



Based on these data, which of the following statements is correct?

• A. $\text{T}\text{l}^{+}$ is more stable than $\text{A}\text{l}^{3 +}$
• B. $\text{A}\text{l}^{+}$ is more stable than $\text{A}\text{l}^{3 +}$
• C. $\text{T}\text{l}^{3 +}$ is more stable than $\text{A}\text{l}^{3 +}$
• D. $\text{T}\text{l}^{+}$ is more stable than $\text{A}\text{l}^{+}$

Answer 1

Answer: (D)

$\Delta \text{G}^{\text{o}}=-\text{n}\text{F}\text{E}^{\text{o}}$

if $\text{E}^{\text{o}}= \, \text{p}\text{o}\text{s}\text{i}\text{t}\text{i}\text{v}\text{e}; \, $ then $\Delta \text{G}^{\text{o}}=\text{n}\text{e}\text{g}\text{a}\text{t}\text{i}\text{v}\text{e}$ ,

For those conversions whose $\text{E}^{\text{o}}$ values are more positive are more favourable.