Question

Which one of the following conditions will increase the voltage of the cell represented by the equation?
$Cu\left(s\right)+2A{g}^{+}(aq.)\rightleftharpoons C{u}^{2+}(aq.)+2Ag\left(s\right)$.

• A. Increase in the dimension of $Cu$ electrode
• B. Increase in the dimension of $Ag$ electrode
• C. Increase in the concentration of $C{u}^{2+}$ ion
• D. Increase in the concentration of $A{g}^{+}$ ion

Answer 1

The correct option is D Increase in the concentration of $A{g}^{+}$ ion

Cell voltage will increase, either by increasing the concentration of $C{u}^{2+}$ ion or by decreasing the concentration of $A{g}^{+}$.
$Q=\frac{\left[C{u}^{2+}\right]}{\left[A{g}^{+}\right]}$
Lesser is the value of $Q$, greater is the cell voltage.