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The standard reduction potentials at 298K for following half reaction are given against each.
$Zn^{+2}(aq)+2e^-\leftrightharpoons 2n(s)=-0.762$
$Cr^{+3}(aq)+3e^-\leftrightharpoons Cr(s)=-0.740$
$2H^+(aq)+3e^-\leftrightharpoons H_2(g)=0$
$Fe^{+3}(aq)+e^-\leftrightharpoons Fe^{+2}(aq)=0.770$.

Which is the strongest reducing agent ?

$\begin{array}{1 1}(a)\;Zn(s)\\(b)\;Cr(s)\\(c)\;H_2(g)\\(d)\;Fe^{+2}(aq)\end{array}$

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$Zn^{+2}(aq)$ having minimum reduction potential.So oxidation potential of Zn(s) will be maximum and it will be strongest reacting agent.
Hence (a) is the correct answer.
answered Feb 17, 2014 by sreemathi.v
 

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