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E0 values of Zn^(2+), Zn , Mg^(2+), Mg ...

`E_0` values of `Zn^(2+), Zn , Mg^(2+), Mg and Cu^(2+), Cu` are `-0.76 V, -2.36 and 0.34 V` respectively.
(a) Which metal can be extracted even from its aqueous solutions by electrolysis ?
(b) Which metal acts as best reductant ? Write reactions .

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