Question

Consider the following electrolytic cells
(i) M(s) | M\textsuperscript{2+(aq), 0.1M || X\textsuperscript{2+}(aq), 0.01M | X(s)
(ii) M(s) | M\textsuperscript{2+}(aq), 0.1M || X\textsuperscript{2+}(aq), 0.1M | X(s) and
(iii) M(s) | M\textsuperscript{2+}(aq), 0.01M || X\textsuperscript{2+}(aq), 0.1M | X(s)
The cell EMF of the above cells are E\textsubscript{1}, E\textsubscript{2} and E\textsubscript{3} respectively. Which one of the following is true?}

• A. E\textsubscript{1} $>$ E\textsubscript{2} $>$ E\textsubscript{3}
• B. E\textsubscript{2} $>$ E\textsubscript{3} $>$ E\textsubscript{1}
• C. E\textsubscript{3} $>$ E\textsubscript{1} $>$ E\textsubscript{2}
• D. E\textsubscript{1} $>$ E\textsubscript{3} $>$ E\textsubscript{2}
• E. E\textsubscript{3} $>$ E\textsubscript{2} $>$ E\textsubscript{1}

Hint:

Think of chemical potential like water pressure: higher concentration at the "source" (Cathode) and lower concentration at the "sink" (Anode) creates the highest flow (EMF)!

Answer 1

Answer: (E)