Question

The EMF of the cell $Tl/T{l}^{+}(0\cdot 001M)\Vert C{u}^{2+}(0\cdot 01M)/Cu$ is $0.83$. The cell EMF can be increased by

• A. Increasing the concentration of $T{l}^{+}$ ions.
• B. Increasing the concentration of $C{u}^{2+}$ ions.
• C. Increasing the concentration of $T{l}^{+}$ and $C{u}^{2+}$ ions.
• D. None of these

Answer 1

Answer: (B)

The oxidation potential $\propto \frac{1}{\text{ Concentration of ions }\mu }$ and reduction potential $\propto$ concentration of ions. The cell voltage can be increased by decreasing the concentration of ions around anode or by increasing the concentration of ions around cathode