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

Options

A. `p(H_2) =1 atm and [H^+] = 1M`
B. `p(H_2)= 1 atm and [H^(+)] = 2M`
C. `p(H_2) = 0.2 atm and [H^(+)] = 1M`
D. `p(H_2) = 0.2 atm and [H^(+)]=0.2 M`

Answer

B, C

Explanation

`E_(RP) = E_(0)^(0) -(0.0591)/(2) log""(PH_2)/((H^(oplus))^(2)) , 2H^(oplus) + 2e^(-) implies H_2`
` -E _(OP) = + (0.0591)/(2) log""((H^(oplus))/(P_(H_2)))`
a) `E_(RP ) = -E(OP) = 0 ` b) `E_(RP) = -E_(OP) = +ve ` c) `E_(RP) = -E_(OP) = +ve` d) `E_(RP) = -E_(OP) = -ve`