The reduction potential of hydrogen half-cell will be negative if :

Options

A. `p(H_(2))=2 "atm and" [H^(+)]=1.0 M`
B. `p(H_(2))=2 "atm and" [H^(+)]=2.0 M`
C. `p(H_(2))=1 "atm and" [H^(+)]=2.0 M`
D. `p(H_(2))=1 "atm and" [H^(+)]=1.0 M`

Answer

A

Explanation

`Pt"|"H_(2)(g)"|"H^(+)(aq)`
`H^(+)+e^(-) rarr 1/2 H_(2)(g)`
`E=E^(@) - (0.059)/(1) log. ((pH_(2))^(1//2))/([H^(+)])`
`E=E^(@) - (0.059)/(1) log. ((2)^(1//2))/(1) = -ve`