Question

A hypothetical electrochemical cell is shown below
$A|A+ (xM)|| B+ (yM)| B$
The emf measured is +0.20 V. The cell reaction is:

• A. $A^+ + B → A + B^+$
• B. $A^+ + e^- → A; B^+ + e^- → B$
• C. the cell reaction cannot be predicted
• D. $A + B^+ → A^+ + B$

Answer 1

Answer: (D)

$A + B^+ → A^+ + B$

Answer 2

Cell is represented as Anodic compartment ∣∣ Cathodic compartment
Thus, in $A∣A^+∣∣B^+∣B$
At the anode (left side): $A → A^+ + e^-$
At the cathode (right side): $B^+ + e^- → B$
The overall cell reaction is:
$A + B^+ → A^+ + B$
This represents the process occurring in the electrochemical cell, where A is oxidized at the anode to form A+ and B+ is reduced at the cathode to form B.

So, the correct option is (D): $A + B^+ → A^+ + B$