Given $\mathrm{E}_{\mathrm{Cl}_{2} / \mathrm{Cl}^{-}}^{\circ}=1.36 \mathrm{~V}, \mathrm{E}_{\mathrm{Cr}^{3+} / \mathrm{Cr}}^{\circ}=-0.74 \mathrm{~V}$ $\mathrm{E}_{\mathrm{Cr}_{2} \mathrm{O}_{7}^{2-} / \mathrm{Cr}^{3+}}^{\circ}=1.33 \mathrm{~V}, \mathrm{E}_{\mathrm{MnO}_{4}^{-} / \mathrm{Mn}^{2+}}^{\circ}=1.51 \mathrm{~V}$. Among the following, the strongest reducing agent is :

JEE Main · 2017 · 02 Apr 2017 · Offline · Redox Reactions and Electrochemistry

Given

E_{Cl_{2} / Cl^{-}}^{\circ} = 1.36 V, E_{Cr^{3 +} / Cr}^{\circ} = - 0.74 V

E_{Cr_{2} O_{7}^{2 -} / Cr^{3 +}}^{\circ} = 1.33 V, E_{MnO_{4}^{-} / Mn^{2 +}}^{\circ} = 1.51 V

.

Among the following, the strongest reducing agent is :

Answer: (A)

The strongest reducing agent is the species most eager to be oxidised, which means the most negative standard reduction potential. Here

Cr X^{3 +} / Cr

stands at

- 0.74

V, well below the rest, so metallic chromium gives up its electrons most readily and is the strongest reducing agent of the group.

JEE Main · 2017 · 02 Apr 2017 · Offline · Single correct option