Question

What is the overall cell potential for this redox reaction?

Answer 1

Oxid  # :     0          0                   +2        -1

$equation:Cl_{2} + Ni -----\ \textgreater \ Ni^{2+} + 2Cl ^{-}$

∴ the nickel was oxidized while chlorine was reduced

nickel reduction potential =  - 0.25 V
              but since it is being oxidised the you have to switch the integer sign so the 
              the potential of nickel in this case becomes + 0.25 V

chlorine was reduced thus its reduction potential remains same  = + 1.36 V

Overall Cell potential  =  ∑ of half cell potential

The overall cell potential  =  (+ 1.36) + (+ 0.25)
                                         =   + 1.61 V

∴ the answer would be D