1.

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

Answer»

`p(H_(2))=1" ATM and" [H^(+)]=2.0 M`
`p(H_(2))=1" atm and" [H^(+)]=1.0 M`
`p(H_(2))=2" atm and" [H^(+)]=1.0 M`
`p(H_(2))=2" atm and" [H^(+)]=2.0 M`

SOLUTION :(c ) `2H_((aq))^(+)+2e^(-) to H_(2)(g)``E_((red))=E_((red))^(@)(0.0591)/(n)"log"(pH_(2))/([H^(+)]^(2))`
`=0-(0.0591)/(2)"log"(pH_(2))/([H^(+)]^(2))`
`E_(CEEL)` will be NEGATIVE when `pH_(2) gt [H^(+)]`.


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