The standard potentials at 298 K for the following half reactions are as given Zn2++2e-⇄Zn Eo=−0.762 V2H++2e-→H2(g) Eo=0.000 VCr3++3e-⇄Cr Eo=−0.740 VFe3++2e-→Fe2+ Eo=0.772 VWhich of the following is the strongest reducing agent?

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Zn(s)

H2(g)

Fe2+(aq)

answer is A.

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Detailed Solution

More negative the standard potential, least the reduction tendency of the ion. The corresponding atom has largest oxidation tendency and thus is a strong reducing agent. Zn is the strongest reducing agent.

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