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Find the strongest reducing agent among the following redox couples considering their standard reduction potentials: `Zn^(2+)|Zn=-0.768V, Cr^(+3)|Cr=-0.74V, 2H^(+)|H_(2)(g), Pt=0.00V, Fe^(3+)|Fe^(2+),Pt=0.77V`

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The smaller the standard reduction of a redox couple, greater the tendency of its reduced form to lose electrons, and hence the greater the reducing power the reduced from will exhibit. Among the given redox couples, `Zn^(2+)|Zn` has the smallest standard reduction potential. Hence, Zn has the strongest reducing power.
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The standard reduction potential of Zn is -0.76V and that of Cu is +0.34V . What do they indicate?

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Standard reduction potential (E^(0)) of Mn^(3+)|Mn^(2+) system is higher than that of Cr^(3+)|Cr^(2+) and Fe^(3+)|Fe^(2+) system. Explain.

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