Match the following — Electrochemistry Chemistry Question

💡 Solution & Explanation

(A) Cells (R) and (S) possess identical electrodes operating purely on concentration differences, making them concentration cells. (B) Cell (P) has an overall reaction of Ag+ + Cl- -> AgCl, which is spontaneous (E° > 0). Cell (R) transfers Ag+ from higher (1.0 M) to lower (0.1 M) concentration, which is spontaneous. (C) Cell (Q) converts AgBr to AgCl (from less soluble to more soluble), making it non-spontaneous (E° < 0). Cell (S) is an anion concentration cell transferring Cl- from 0.1 M to 1.0 M, which opposes the natural concentration gradient, making it non-spontaneous. Therefore, correct answer is A-R,S; B-P,R; C-Q,S.