The standard reduction potential at 298 K for the following half cell reactions are given below:
`Zn_((aq))^(2+)+2e^(-)to Zn_((s)),E^@=-0.762 V`
`Cr_((aq))^(3+)+3e^(-)to Cr_((s)),E^@=-0.740` V
`2H_((aq))^++2e^(-)to H_(2(g)),E^@=0.0` V
`Fe_((aq))^(3+)+e^(-)toFe_((aq))^(2+),E^@=0.77` V
Which is the strongest reducing agent?

Options

A. `Zn_((s))`
B. `Cr_((s))`
C. `H_(2(g))`
D. `Fe_((aq))^(2+)`

Answer

A

Explanation

Zn has lowest reduction potential value and it will be easily oxidised. Therefore, it acts as strongest reducing agent.