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

Options

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

Answer

C

Explanation

`2H^(+)(aq)+2e^(-)toH_(2)(g)`
`E_(red)=E_(red)^(@)-(0.591)/(n)log((P_H_(2))/((H^(+))^(2))),E_(red)=0-(0.591)/(2)log((2)/((1)^(2))),E_(red)=-(0.0591)/(2)log2`
`thereforeE_(red)` is found to be negative for (3) options