Question

Identify the reaction from following having top position in EMF series (Std.red. potential) according to their electrode potential at 298 K

• A. $Mg^{2+} + 2e^{-} \to Mg_{(s)}$
• B. $Fe^{2+} + 2e^{-} \to Fe_{(s)}$
• C. $Au^{3+} + 3e^{-} \to Au_{(s)}$
• D. $K^{+}+le^{-}\to K_{(s)}$

Answer 1

Answer: (C)

According to electrode potential series,
$Au^{+3}+3e^{-} \to Au_{(s)}$ (has topmost position $\Rightarrow $ max. SRP)