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The potential of the following cell is 0...

The potential of the following cell is 0.34 volt at `25^@`C. Calculate the standard reduction potential of the Copper half cell.
`Pt //H_(2 (1 atm )) //H_((1M))^(+) // // Cu_((1m))^(2+) // Cu`

A

`+ 0.34 ` volt

B

`-0.34 ` volt

C

`+3.4 `

D

`-3.4` volt

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