Read the Assertion and Reason below and choose the correct option. — Electrochemistry Chemistry Question

💡 Solution & Explanation

For the Daniel cell, E_cell = E°_cell - (0.0591/2) * log([Zn^2+]/[Cu^2+]). Doubling both concentrations leaves the logarithmic ratio identical, meaning the cell EMF does not change. Statement I is true. Electrode potential is related to concentration logarithmically (via the Nernst equation), not linearly. Doubling the concentration adds a small logarithmic term to the potential, it absolutely does not double the potential. Statement II is false. Therefore, correct answer is C.