Question

The standard reduction potential at $298K$ for the following half cell reaction
$Z{n}^{2+}(aq)+2e^{-}\to Zn(s);E^0=-0.762V$
$C{r}^{3+}(aq)+3e^{-}\to C{r}_{(s)};E^0=0.740V$
$2H^{+}(aq)+2e^{-}\to Hz(g);E^0=0.0V$
$F_2(g)+2e^{-}\to 2F^{-}(aq);E^0=2.87V$
Which of the following is strongest reducing agent ?

• A. Zn(s)
• B. Cr(s)
• C. $H_2(g)$
• D. $F_2(g)$

Answer 1

Answer: (A)

More the negative value of reduction potential. higher the reducing power, thus the strongest reducing agent is zinc.