Question

Why could the cell potential for the Cl2 (g) |2 Cl- (aq) || Ag+ (aq) | Ag (s) cell not be determined?

Answer 1

was this from an experiment you did, or is this a theoretical question?

Answer 2

@JFraser it's one of the theoretical questions

Answer 3

without looking at a reference table, i'd have to guess that the reaction isn't spontaneous, so the actual voltage produced by a cell with those components would be zero