Q31 / 180 · COMEDK 2018 · Chemistry
Which one of the following condition will increase the voltage of the cell represented by the equation.
$\mathrm{Cu}(s)+2 \mathrm{Ag}^{+}(a q) \rightleftharpoons \mathrm{Cu}^{2+}(a q)+2 \mathrm{Ag}(s)$
- Aincrease in the dimensions of $\mathrm{Cu}$ electrode
- Bincrease in the dimensions of Ag electrode
- Cincrease in the concentration of $\mathrm{Cu}^{2+}$ ions
- Correct answerDincrease in the concentration of $\mathrm{Ag}^{+}$ions
Solution
According to Nernst equation,
$$
E_{\text {cell }}=E_{\text {cell }}^{\circ}-\frac{0.0591}{n} \log \frac{\left[\mathrm{Cu}^{+2}\right]}{\left[\mathrm{Ag}^{+}\right]^{2}}
$$
$\therefore$ The voltage of cell will increase with increase in concentration of $\mathrm{Ag}^{+}$ions.
Hence, the correct answer is option: 'D'.