question_answer

The standard reduction potentials at 298 K for the following half reactions are given against each: \[Z{{n}^{2+}}(aq)+2{{e}^{-}}\to Zn(s)\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,{{E}^{o}}=-0.762V\] \[C{{r}^{3+}}(aq)+3{{e}^{-}}\to Cr(s)\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,{{E}^{o}}=-0.740V\] \[2{{H}^{+}}(aq)+2{{e}^{-}}\to {{H}_{2}}(s)\,\,\,\,\,\,\,\,\,\,\,\,\,\,{{E}^{o}}=-0.00V\] \[F{{e}^{3+}}(aq)+3{{e}^{-}}\to F{{e}^{2+}}(aq)\,\,\,\,\,\,\,\,\,\,{{E}^{o}}=-0.762V\] The strongest reducing agent is:

A)  \[Zn(s)\]         

B)  \[Cr(s)\]

C)  \[{{H}_{2}}(g)\]          

D)  \[F{{e}^{2+}}(aq)\]