Redox and electrochemistry — Question 19

QUESTION 19

Three voltaic cells are constructed with metal Q as one electrode and metals R, S or T as the other electrode. The potential differences for the cells are shown in the table.

Voltaic cell	Half-cell	Half-cell	Potential difference (V)
1	Q(s) / Q2+(aq)	R+(aq) / R(s)	1.18
2	Q(s) / Q2+(aq)	S2+(aq) / S(s)	0.72
3	T(s) / T3+(aq)	Q2+(aq) / Q(s)	0.95

The relative strength of the reducing agents from strongest to weakest is

(A) T > Q > S > R

(B) S > Q > T > R

(C) R > Q > S > T

(D) Q > R > T > S