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The reduction potential of hydrogen half...

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

A

`p(H_(2)) =2 atm[H^(+)] = 1.0M`

B

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

C

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

D

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

Text Solution

Verified by Experts

The correct Answer is:
A
`2H^(+) +2e rarr H_(2)(g)`
Applying Nernst Equation
`E_(H^(+)//H_(2)) = E_(H^(+)//H_(2))^(@) - (0.059)/(2)log.(pH_(2))/([H^(+)]^(2))`
`E_(H^(+)//H_(2)) = 0`
`:. E_(H^(+)//H_(2))^(@) = 0 - (0.059)/(2) log.(pH_(2))/([H^(+)]^(2))`
For the negative nature of `E_(H^(+)//H_(2))`
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Knowledge Check

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

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

  • What will be the oxidation potential for the following hydrogen half cell at 1 bar pressure and 25^(@) C temperature ? Pt|underset("1 bar")(H_(2(g)))|HCl_((aq))pH= 3

    A
    0.059 V
    B
    0.188 V
    C
    0.177 V
    D
    0.000 V

  • What is the oxidation potential of given hydrogen half cel at 1 bar pressure and 25^(@)C temperature? Pt|underset("1 bar")(H_(2(g)))|HCl_((aq))pH=3

    A
    `0.059V`
    B
    `0.188V`
    C
    `0.177V`
    D
    `0.000`V

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