Which defines the standard reduction electrode potential of Zn2⁺ ions?

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${Zn}^{2 +}_{(aq)} + 2 e^{-} ⟶ {Zn}_{(s)}; [{Zn}^{2 +}] = 1 M$

${Zn}_{(g)} ⟶ {Zn}^{(2 +)} + 2 e^{-}; [{Zn}^{2 +}] = 1 M$

${Zn}^{2 +} (aq) ⟶ {Zn}_{(s)} + 2 e^{-}; [{Zn}^{2 +}] = 1 M$

${Zn}^{2 +}_{(g)} ⟶ {Zn}_{(s)} - 2 e^{-}; [{Zn}^{2 +}] = 1 M$

answer is A.

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Detailed Solution

Standard reduction potential measures the tendency for a given chemical species to be reduced. The electrode potential for a reduction process at standard conditions of 298K , molarity= 1 is called standard reduction potential .[Zn²⁺]= 1 M and Zn²⁺ is reduced to Zn is SRP of Zn.

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