1.

When standard half-cell reduction potential of hydrogen would be negative ?

Answer»

`p(H_(2))=2` ATMOSPHERE and `[H^(+)]=1.0M`
`p(H_(2))=2` atmosphere and `[H^(+)]=2.0M`
`p(H_(2))=1` atmosphere and `[H^(+)]=2.0M`
`p(H_(2))=1` atmosphere and `[H^(+)]=1.0M`

Solution :`Pt|H_(2(g))|H_((aq))^(+)`
`H^(+)+e^(-) to (1)/(2)H_(2(g))("REDUCTION")`
`E=E^(@)-(0.059)/(1)"LOG"([P_(H_(2))]^((1)/(2)))/([H^(+)])`
`E=E^(@)-(0.059)/(1)"log"((2)^((1)/(2)))/(1)=-ve`


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