Q. The standard (reduction) electrode potentials for metal-metal ion $ (M/M^{2+}) $ electrodes $ P, Q, R $ and $ S $ are respectively $ -0.44 \, V, +0.34\, V, -0.76\,V $ and $ -0.25 \, V $ The increasing order of their reducing capacities is
J & K CETJ & K CET 2016Redox Reactions
Solution: