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what is the emf at 25^(@)C for the cell,...

what is the emf at `25^(@)C` for the cell,
`Ag|{:(AgBr(s)" " Br^(-)), (" "alpha = 0.34):}||{:(Fe^(3+) " " Fe^(2+)), (alpha = 0.1 " " alpha = 0.02):}|Pt`
The standard reduction potentials for the half-reactions `AgBr + e^(-) rightarrow Ag + Br^(-) and Fe^(3+) + e^(-) rightarrow Fe^(2+)` are +0.0713V and +0.770V respectively.

A

0.474 volt

B

0.529 volt

C

0.356 volt

D

0.713 volt

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The correct Answer is:
B
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