The standard reduction potential at 298 K for the following half cell reaction are
`Zn^(2)(aq) + 2e rarr Zn(s)E^@ = -0.762 V`
`Cr^(3+)(aq) + 3e rarr Cr(s)E^@ = 0.740 V`
`2H^+(aq)+ 2e rarr H_2(g)E^@ = 0.0V`
`F_2(g) + 2e rarr 2F^(-) (aq)E^@ = 2.87 V`
Which of the following is strongest reducing agent ?

Options

A. `Cr_(s)`
B. `Zn_(s)`
C. `H_(2(g))`
D. `F_(2(g))`

Answer

B

Explanation

Lower the reduction potential, more easily it is oxidised and stronger is the reducing agent. As zinc has high negative value of reduction potential hence, it is the strongest reducing agent.