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The reduction potential (E^0 ,in V) ...

The reduction potential ` (E^0 ,`in `V)` of` Mn(s) ` is _____.
[ given ` E_((MnO_(4)^(-)(aq)//MnO_(2)(s)))^(0)=1.68 V,E_((MnO_2 (s)//Mn^(2+) (aq)))^0=1.21 , E_((Mn^(2 +) (aq) //Mn (s))^(0)=-1.03 V]`

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