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.