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The E^(@) values for the changes given b...

The `E^(@)` values for the changes given below are measured against NHE at ` 27^(@) C `
`Cu^(2+) + e to Cu^(+) , E^(@) = + 0.15 V `,
`Cu^(+) + e to Cu, E^(@) = + 0.50 V `,
`Zn^(2+) + 2e to Zn , E^(@) = - 0.76 V `.
The temperature coefficient of emf a cell designed as `Zn|Zn^(2+) || Cu^(2+) || Cu` is ` - 1.4 xx 10^(-4)v` per degree . For a cell reaction in equilibrium `DeltaG= 0 and DeltaG^(@) = -2.303 RT log K_(c)`. The heat of reaction and entropy changes during the reaction are related by `DeltaG = DeltaH - TDeltaS`.
The `E^@` for the reaction `2Cu^(+) to Cu^(2+) + Cu ` is :

A

`+0.35 V `

B

`-0.35V `

C

`+0.65 V `

D

`-0.65V`

Text Solution

Verified by Experts

The correct Answer is:
A
`Cu^(+2) +e^(-) to Cu^(+1) , 0.15 xx 1 , Cu^(+1) + 1e^(-) to Cu, (0.50 xx 1)`
` 2Cu^(+1) to Cu^(+2) + Cu , (E^(0) xx 1) , (E^(0) xx 1) = 0.50 - 0.15 = 0.35 V `
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Knowledge Check

  • The E^(@) values for the changes given below are measured against NHE at 27^(@) C Cu^(2+) + e to Cu^(+) , E^(@) = + 0.15 V , Cu^(+) + e to Cu, E^(@) = + 0.50 V , Zn^(2+) + 2e to Zn , E^(@) = - 0.76 V . The temperature coefficient of emf a cell designed as Zn|Zn^(2+) || Cu^(2+) || Cu is - 1.4 xx 10^(-4)v per degree . For a cell reaction in equilibrium DeltaG= 0 and DeltaG^(@) = -2.303 RT log K_(c) . The heat of reaction and entropy changes during the reaction are related by DeltaG = DeltaH - TDeltaS . The equilibrium constant constant for the reaction : Zn + Cu^(2+) iff Zn^(2+) + Cu is

    A
    `6.0 xx 10^(36)`
    B
    `1.94 xx 10^(37)`
    C
    `1.47 xx 10^(38)`
    D
    `7.0 xx 10^(30)`

  • The E^(@) values for the changes given below are measured against NHE at 27^(@) C Cu^(2+) + e to Cu^(+) , E^(@) = + 0.15 V , Cu^(+) + e to Cu, E^(@) = + 0.50 V , Zn^(2+) + 2e to Zn , E^(@) = - 0.76 V . The temperature coefficient of emf a cell designed as Zn|Zn^(2+) || Cu^(2+) || Cu is - 1.4 xx 10^(-4)v per degree . For a cell reaction in equilibrium DeltaG= 0 and DeltaG^(@) = -2.303 RT log K_(c) . The heat of reaction and entropy changes during the reaction are related by DeltaG = DeltaH - TDeltaS . The decrease in free energy during the cell reaction in Zn | Zn^(2+) (1M)||Cu^(2+)(1M)|Cu , when its changes to 1M(Zn^(+2)) and 0.1M(Cu^(+2)) is .........

    A
    `2.037 xx 10^(5) J`
    B
    `2.116 xx 10^(5) J`
    C
    `2.037 xx 10^(6) J`
    D
    `2.116 xx 10^(6) J`

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    C
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