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Cr(2)O(7)^(2-) + I^(-) to I(2)+Cr^(3+) ,...

`Cr_(2)O_(7)^(2-) + I^(-) to I_(2)+Cr^(3+) `,
Given `E_("cell")^(0) = 0.79 V, E_(Cr_(2)O_(7)^(2-)//Cr^(3+))^(0) = 1.33 V , E_(I_(2)//I^(-))^(0) = ? `

A

`0.54 V`

B

`-0.54 V`

C

`+0.18 V`

D

`-0.18V`

Text Solution

Verified by Experts

The correct Answer is:
a
In the given reaction, `I^(-)` is oxidised to `I_(2)" and "Cr_(2)O_(7)^(2+)` ions have been reduced to `Cr^(3+)` . The cell is
`Pt, I_(2) I^(-) ||Cr^(3+),Cr_(2)O_(7)^(2-)|Pt`
`E_("cell")^(0) = E_(Cr_(2)O_(7)^(2-)//Cr^(3+))^(0) - E_(I_(2)//I^(-))^(0) `
` 0.79 = 1.33 - E_(I_(2)//I^(-))^(0) `
` E_(I_(2))^(0) = 0.54 V`
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