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Two electrochemical cells are Zn | Zn^2+...

Two electrochemical cells are `Zn | Zn^2+ || Cu^2+ | Cu`and `Fe | Fe^2+ | |Cu^2 | Cu` are connected in series. What will be the emf of the cell at `25^@ C`. Given `E^@ Zn^2+ | Zn = -0.76 v E^@ Cu^2+ | Cu = + 0.34v and Fe^2 | Fe = -0.41 v`

A

`1.85 v`

B

`-1.85 v`

C

`+ 0.83 `

D

`-0.83`

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