For the cell: ; V. By which of the following activity, will increase? — Electrochemistry Chemistry Question

💡 Solution & Explanation

The Nernst equation is $E_{cell} = E^\circ - \frac{0.0591}{2} \log \frac{[Ni^{2+}]}{[Cu^{2+}]}$. Decreasing the concentration of $Ni^{2+}$ reduces the value of the logarithmic term, which is subtracted from $E^\circ$, leading to an overall increase in $E_{cell}$. Changing the mass of solid electrodes has no effect. Therefore, correct answer is A.