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Calculate the standard cell potential (i...

Calculate the standard cell potential (in V) of the cell in which following reaction takes place:
` Fe ^( 2 + ) ( aq ) + A g^ + ( aq ) to Fe ^( 3 + ) ( aq ) + Ag (s ) `
Given that ` E _ (Ag ^ + // Ag ) ^ 0 = x V , E _ ( Fe^( 2+ ) // Fe ) ^0 = yV , E _ (Fe^(3+)//F e )^0 = z V `

A

x-z

B

x + y + z

C

z+ 2y - 3z

D

3z - x- 2y

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The correct Answer is:
D
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